Yep, you CAN do it. Two observations about the wing...

1. A twist is not something you want, but the building surface can handle a little twist as lung as you avoid humps or valleys. I say that because just as your covering can twist a straight wing out of shape, it can untwist a twisted wing into a straight on. Againb, that's not something you really want, but it's also not something you can deal with.

2. If you must have perfection, a jig is not as difficult and exotic a thing as people think. Two 1/4" steel rods and a pair of 2x4 blocks to hold them up makes a fine jig that will assure an amazingly sraight wing at an investment level way ubder five bucks and very little labor at all.

Either way, the plane will fly!