I'm in St. Louis and a representative for a fiberglass manufacturer. Not tool sheds or bathtubs, but custom fiberglass used for special projects and vehicles (i.e. the Wienermobile, Anheuser-Busch beer school, fiberglass Shamus for Sea World- the whole works).
If anyone in St. Louis could provide a fiberglass hardtop for a few days (or send some dimensions and really good pictures of theirs) I'd be more than willing to have them figure out a cost for fabricating it. I've seen a D90 fiberglass hardtop before in person and know they could fabricate one sturdier.
And as with any other project that requires a mold, producing five or 10 of these is going to be significantly cheaper than producing one (cost of the mold spread over the number of tops produced).
If anyone wants to check out the manufacturer, the website is www.craftsmenind.com
. Look under "Graphics" and then "3D" for some previous projects.
Anyone able to help? Drop me an email at firstname.lastname@example.org
or call me at 314.477.1919.