Seat Supports

To build the seat supports, I first needs to check my CAD dimensions and copy them to the splines. Below shows how I did that with a straight edge, a clamp to hold it against the frame, and combination square. My square has a level which allowed me to confirm I had a slight pitch from the ends; I designed the ends a half inch higher so water would drain towards the center.  

 Here I show the dry fit of the spline, with the cleats clamped on,  and 1 x 3/4" crosspieces. The holes were to save a bit of weight and improve access from the round top hatch you see just to the right--beside they give it that cool airplane look :-). I spaced the crosspieces 8 inches apart and used a level and strait edge to confirm everything was right before marking and epoxy gluing every in. The stern seat was done the same way. Each spline has a limber hole on its low end that you can't see in the picture.

 I used solid clear yellow pine for the aft of the mid seat support. The arching curve are mostly cosmetic and should be as strong as the traditional 1x2" straight hardwood pieces set on edge cleats.

I'll be fitting the seats next time.