This is something that I know John is currently considering, and has been for some time.
The format in the Road section was brought in as a trial and, as far as I am aware, has been reasonably well received.
The only foreseeable issue would be when complete bikes which don't sell get split up for parts.
It would rely on sellers to make sure that their threads are kept up to date if this happens so the thread can be locked or removed if required.
Other than that I don't see any other problems with it.
I'm sure that John would appreciate any input on this from everyone though...