I had to make a return trip to the local "lumberyard" and pick up the raw material I'll need to build the roof...
Here I have taken the thinner strip from the above photo and cut the roof pieces to shape... wider in back, tapered towards the windshield posts. I pre-curved these pieces by placing them in boiling water for about a minute, then bending them to shape against a ship curve and holding them to the curve with a rubber band until the wood dried. I also carved a header piece to fit tightly against the top of the windshield frame, which has a slight arc to it side to side. The header, the front ends of the top pieces, and the little reinforcing corner blocks are glued in place with CA. I'll let all of this dry overnight, then glue the rear ends of those roof pieces down to the tops of the rear side body panels. The door posts are just placed in position here (not glued)... I just need them here to force the top pieces into the correct arc. Once I glue the rear of the top pieces I'll remove the door posts... at that time the glued top pieces will hold the correct arc to later receive those door posts once I attach the doors to them.