The hull may be symmetrical, but the inside liner on the old DS1's aren't. I got a little frustrated measuring, and of course, it is a boat so there aren't any right angles and lots of curves. I'm going to have to do this by eye
I milled up some red cedar to for the seat cleats and am plan to work my way aft starting with the thwarts. The recycled floorboards are quite thin so the starting piece is a nice piece of teak to act as a bullnose. I'm leaving room in front of the seats for a place to stand and to put your feet if the crew wants to sit facing forward. We get enough strange bruises so the first rule is to avoid sharp edges. Then the first piece of recycled floorboards.
Yes, the wood is narrow so I'm going to cut to size and then join. I'm not sure how to join long thin old twisted pieces of floorboards but no doubt it will come to me. I was going to build the support frame first ..... I'm going to have to wing it and build the seats then support it.