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Thanks for asking. I had a look at some finished bow sections and the copper plates have been put on the second planking and a wooden strip has been glued along the join between the second planking and the copper plates. This way the difference in thickness between the copper plates and the second planking doesnt look obvious
Please check the instructions again as to where the frames and gunports should be, since they should not conflict with each other if the kit manufacturer made the kit design correctly. I think something may be off position on your model, or you are plotting the gun ports in the wrong locations. I have dealt with gun ports being too close to frames before, but that was because I MOVED the gunports and changed the design of the model myself, and had to cut away the frame bulkheads to make room for gun carriages and rigged gun tackles. A kit manufacturer makes mistakes on occasion, but usually not ones that offer great conflict with parts interference. Since your model is a cutaway of a hull, a conflict between gun ports and frames is serious because it will be PLAINLY VISIBLE. So, my solutions to the problem will not work for your model. Check your parts locations and take measures and compare them to the model plans.
Late responding to your original question, but since there haven't been any better suggestions, my recommendation would be to complete your second planking over the entire hull before coppering. If you only do second planking down to the waterline then continue with copper, then the the copper will be flush with or slightly below the surface of the planking. That wouldn’t look right to me since coppering went on top of the planking on the real thing.
Are you using plans or a template? The plans are an orthogonal projection of the 3D hull onto a flat surface, so the alignment will be off near the stern and particularly the bow where the hull curves away from imaginary surface the plans represent. A template designed to conform to the shape of the hull should already have accounted for that.
A little cheating was done on the actual framed ships as some frames were jogged to allow the gun ports to line up with a frame on each side. Not quite the same as moving the ports instead of the frames, but the spaces were not always the same between ports on a given deck and ship.
Thanks for the detailed reply. The frames are in the correct place and two of the top row of gunports on each side would have been exactly in the middle of them. I have moved them over a bit and they now clear the frames. I have moved them along half the width of the gunport so it wont be noticed. Perhaps the template is wrong.Does the gunport just barely catch the edge of a frame? or does the frame go right through the middle of where the gunport would be?
I would think the first step would be to see what is out of place on your build. Do you have the frame in the wrong place, or do you have the gunport template in the wrong place? or is the gunport supposed to be where the frame is?
Thanks for the reply. Two gunports on the top row would have been in the middle of the frames so I have moved the holes slightly.. It wont be noticedPlease check the instructions again as to where the frames and gunports should be, since they should not conflict with each other if the kit manufacturer made the kit design correctly. I think something may be off position on your model, or you are plotting the gun ports in the wrong locations. I have dealt with gun ports being too close to frames before, but that was because I MOVED the gunports and changed the design of the model myself, and had to cut away the frame bulkheads to make room for gun carriages and rigged gun tackles. A kit manufacturer makes mistakes on occasion, but usually not ones that offer great conflict with parts interference. Since your model is a cutaway of a hull, a conflict between gun ports and frames is serious because it will be PLAINLY VISIBLE. So, my solutions to the problem will not work for your model. Check your parts locations and take measures and compare them to the model plans.
My model showing hull bulkheads relative to gun ports. Look how close the gun carriages are in sereval locations. Note that on my model the locations of the bulkheads are NOT the same as they would be on the real ship. Originally I assumed that the kit manufacturer made them so, but learned later than they were not. Guns on the lower gun deck were supposed to be fake cannon barrels sticking into pieces of wood, not complete cannon carriages, so when I desired to install complete carriages, Aither the wheels on one side of a carriage had to be made thinner or a section of the bulkhead had to be cut away to allow more space, before the first layer of planking was laid down.
View attachment 521873
Carriages sat right up against bulkheads on this model, which would not be the case on a real ship. Frames would not be this close to guns, or the gun crews would not be able to operate the guns. This model was clearly designed to be viewed from the outside only, and the interior is totally hidden. Your cutaway model must reflect the actual location of frames and gunports.
View attachment 521874
Check your work against Jeff-E's on the Model Ship World forum. His build log is very detailed. It can help you find where things may be going off track on your model.
Jeff-E
Posted October 24, 2013
Hi All,
After they were maked out and I was happy with the positon of them the gunports were cut out. This was done as per the instructions by drilling a series of small holes inside the marked lines and then carefully cutting out that section and finally finishing it to size with a file.
Strange. The other build logs did not mention an alignment problem.
Stupid question: Is the template being laid on the hull backwards?
Done that one once! 
I have found the problem. The template is cut out incorrectly. I had a look at the earlier pic of Jeff-E bow and it clearly shows a long spaceStupid question: Is the template being laid on the hull backwards?
from the l/h edge to the start of the first top gunport and equal spacing to ports 2 and 3. Then a smaller distance to the edge of the planking. The picture of the template shows the distance from the l/h edge of the bow to the start of gunport 1 is 35mm. Its the same 35mm from gunport 1 to gunport 2 and also to gunport 3 Then its 11mm to the r/h edge of the bow. You can see that the template shows gunport 1 l/h side is almost in line with the r/h edge of gunport 5 but the photo from the instruction book shows the r/h edge of gunport 1 almost in line with gunport 6 l/h. I cant think how they have cut out the template incorrectly. The masking tape is there because I cut out this part to try and make it fit correctly but its back in the exact position before I cut it The pictures are the template and a photo from the instruction book
