Bit late seeing this but if showroom isn't right what about car park ? Spent many an evening, pint glass in one hand, shivering in the cold chatting about peoples cars in a pub car park. Always seems to be some more interesting cars parked in show car parks than in the showground, been to a lot of one make shows over the years !
Makes sense to go with whats been suggested though.
With many retro riders either being self employed or working for small firms would it be possible to have a link to the various firms and services they can offer? even if its only distance selling stuff at present eg emails/phone calls and the stuff sent by courier?
What about for finished builds or current state of the builds a page or section Cars of Retro Rides as an alphabetical gallery with an image for each make and/or car. Alphabetical so it is easy to look up a particular car or brand.