Well, the cap will have both a front to back curve and side to side curve, as well as the side being sloped. I just haven't figured out how to do all that in sketchup. My plan is to make a wooden frame that will have the basic shape and than cover it in insulating foam and refine it even more, then fiberglass it and do any final body work necessary.
Oh, and here's a side shot. If someone could put this against that airfoil, it would greatly be appreciated.