On Sat, 4 Jan 2014 09:13:15 -0800 (PST), stryped
wrote:

How would you do this in fiberglass and what k7nd of cost would be involved?
You would make a "dummy" of the body, then make a mould over the
body dummy, then lay up a body in the mould - or make a form for the
body out of foam and fiberglass over the foam, then remove the foam,
and sand for a few weeks to get the surface smooth. Less work overall
just to make it out of steel (or aluminum). If your "dummy" pattern is
smooth, and your mould is smooth, your body will be relatively smooth
and require a LOT less sanding..

Or just buy a fiberglass bucket - they are available in varying
quality, at a wide range of prices, from numerous suppliers (the
simplest way)