These folks have fenders and patch panels for the A; http://www.gaslightauto.com/ModelAmain.htm
Looks like the catalog pdf. link is down right now, but the phone still works.
Also, Brookville makes a lot of sheetmetal stuff, here's the index. Some of the parts are listed as roadster but are common to the coupe;http://www.brookvilleroadster.com/rod/index.html

Here's a rod shop in Pa. that sells hot rod style replacement floors and firewalls made by a competitor of Bitchin' called Direct Sheetmetal. Their prices are a little better and the quality is comparable. If you look at the auction pricing they've got, in tiny letters it says "or best offer". They will take less and the shipping is included, best deal I've found for this kind of stuff without getting dealer price; http://stores.ebay.com/CEN-PEN-Speed...QQftidZ2QQtZkm