After some sanding and trimming the deck is now fitted to the base, so far so good.
However my first glitch came when about to install the channel piece between the bulwark and deck, the plans said it was 125mm but mine was approximately 1mm short coupled with the base being approximately 2mm wider than if the correct size channel was to fit snuggly.
So what to do, it seems strange that the precut pieces were somewhat larger than they should have been, and I didn't have the ruler out measuring everything before getting to this point.
I didn't have this size or shape wood to hand and am not really geared up to make a new piece so the only thing left was to make some filler pieces at the ends with some scraps and shape it to match.
You can see my efforts on the ends and I will stain them to hopefully match in a bit better, I don't think the eye will be drawn to this once the model is completed.
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