The main problem of imcdb is not that it was designed few years ago but rather that it was designed as a too simple "list" thing.
It would have been better to make a more complex structure, really adapted to vehicle listing.
I still plan to do that, it would just require to convert existing data (not especially impossible).
For example I like the way that some Wikipedia page display make's vehicles with a timeline + grouped by type (family sedan, suv, sportscar, etc.)
I'd like to have something similar rather than just an alphabetic listing of all, which is probably not so useful as it do not allow to have an easy view of all models of a make.