How about interchangeable decks. The replacement decks could be sold seperately.The basic car would come with a removeacle plastic wood deck that could be replaced by a laser cut wood deck, or a plastic or resin TOFC deck with tie down chains ,bridge plates,etc. BLW briefly offered such a deck to retrofit the Atlas Flat Car,I wish now I had bought more than four.I would like to see a good car that was the leingth of the current Walthers and Athern GSC cars,but with a bit more detail and body mounts. Metal wheels as everyone has pointed out are a modelers choice thing.Maybe also nice plastic, or etched bulkhead ends in several styles could be offered as an add on. Nate Goodman (Nato). Salt Lake, Utah.