The JMP Starfire had 1/8" ply main fuselage formers that extend into the wings and become the wing spars. The Yellow kit has been upgraded with thicker main formers, so that the plug in wing fittings can be bolted to them. I'm guessing that the foam wings on the YA kit are also redesigned somewhat to accept the aluminum spars. The JMP fuselage has some grooves at the wing root to allow for applying some glass cloth at the wing / fuse joint.

If I were building the JMP kit, I would also determine if it is a Starfire IIa or a IIb kit. The IIb version has larger flaps. You could probably get a hold of a set of IIb plans and modify a IIa to have the larger flaps.

Good luck.

Let's see.......the last bid was $70...........................I'll go $100. I need another one to go with the 2 I have in my shop now.