Installing the 2x4x600mm bulwark inner rails turned out to be time consuming. The rails were to be glued and nailed to the timberheads and the included stock wasn't quite long enough so a splice was required.
I predrilled a pilot hole at the leading edge of the rail and the first timberhead then temporarily pinned the rail in position. Then after clamping the rail to all the timberheads I trusted my old eyes that I could accurately mark the center of each timberhead onto the rail for drilling. The reason for all the clamps is because of the extreme bow of the hull and I wanted to be as accurate as possible marking the C/L's.
After all the C/L's were marked I unclamped the rail and took them to my drill press where I had made a fixture which would allow me to slide the rail along and drill all 90 holes along the center of the rail at each marked nailing position. Now the anxious part. I again pinned the rail to my first pilot hole and clamped the rail at each timber head and to my amazement all the holes aligned with the timberheads.
Removed all the clamps and put a small spot of glue on the timbereheads the re-clamped the rail and let the glue set up in preparation for drilling the nail holes. I only did about a third of the rail at a time so all the glue wouldn't set up before I finished aligning clamping the rail in place.
Drilling the pilot holes into the timberheads was tedious as I had to drill the holes using a drill bit installed in my smallest pin vise and drilling by hand as none of my drills were small enough to fit. The holes are about 3/8 inch above the deck. Foredom has advertised a right angle handset for their rotary tool which would allow me to use a powered drill unfortunately it is for their flexible shaft units not their MicroMeter unit that I have. Oh well, another tool didn't 'have' to purchase.
After the glue set up I stared drilling and nailing the rails. As the holes were only 'pilot holes' I had to push the nails in. I used a pair of small long nosed vice grip pliers with a small block of maple attached to one side of the jaws to protect and spread the load against the outside of the hull while 'pressing the nail in place.
Can never have enough clamps
My drill setup
Hand drilling. Not showing the callus on my thumb when finished