You're right. Amiga.org looks lovely, but aspects are beginning to look a bit dated - those modules down the left for example...
I'd love to have a go, but to be honest I can't really remember how. I've spent so long working with XHTML/CSS that designing for Amiga browsers (and the other Netscape 4-alikes of this world) is simply a case of making sure the site is still fully accessible without stylesheets.
I'd quite like to have a go though. Mock an image up and let a more "retro" oriented web designer have a go at turning it into a website?
Oh, and could you make available the logos, fonts and so on needed to apply your corporate ID to the new design?