Your spinner should match the nose of your airplane unless the engine is totally open, then use whatever looks good as long as it doesn't cover too much prop. You may have to carve out the openings some so it will fit over your prop. As to the warped wing, I assume since you said it was built up balsa it's covered with a heat shrink material. Just twist the wing opposite the warp a little bit past straight (a helper makes this easier!). You'll notice the covering wrinkles when you do this. Holding the wing with the induced opposite twist, simply shrink the covering where it's wrinkled. If it's not right on, adjust it by continuing the same process. You can use either a heat gun or an iron on it. Good luck!