There is quite a lot of art, yes!
However a lot of the last year of work on my part was learning, working out how we were going to do things, refining our process for exporting art etc.
Also we now have pistons, conrods, valves etc. that can be used in all engines, and it won't be too hard to modify existing heads and blocks into different configs.
So, the engine stuff is fairly in the bag, probably only a few months work for me, but we certainaly don't want to add any EXTRA art at the moment though, as there IS still a lot of art of chassis, suspension, brakes, body panels, factory buildings... etc.
Please, go ahead and suggest things though, we actually do have a "That'll go in if we get to make an expansion" list! (Actually, I might even make a thread for it)