Anyone know a good way to make a belly baggage pod?

My Jurca Sirocco has so little baggage space, that it really needs
some extra room. I'd like to make a bomb-shaped belly pod, and have
seen some made on other homebuilts. I've heard of some of the Pitt's
S-1 guys welding two spinners together, back to back, but that doesn't
have the look I want. I've got 4 quarter inch bolts that are on the
bottom of the belly that hold the pitot's seat down, and would be
perfec hard points to attach a pod to. I plan to fly to Oshkosh and it
would be great to have some extra room for stuff. I can't figure out
how to mold a shape like that. Any suggestions? I'm talanted in
fiberglass work, as I've been building a Glasair 3 for 14 years, --
still working on it. It would be great if someone made a pod I could
purchase.