If per chance you do decide to jig up the parts
, then make sure that the jig puts a bit more curve in than you will need. The wood will relax some even after steamed to a jig. Don't ask me how much, its a learning
experience. I know this because I once made up 31 pairs of stub ribs for my last wooden boat. I didn't have a steam box so I put a couple of bricks into a 5 gallon pail, filled it with water
to the top of the bricks and set the ribs in vertically. Covered the top with a towel and put the thing on my kitchen stove. Once steamed/boiled for a while, about an hour per square inch (I think, it was a long time ago), I pulled out the stubs a couple at a time and bent them in a jig made with a hydraulic jack and some steel
bars. It worked quite well but took a while to get the degree of pressure down pat.