Polishing the Rolls

I'm going over the vehicles I've already created and raising their quality. Each needs some extra modelling; looping engine sounds without glitches; an icon for the GUI; detailed tweaks on engine strengths, friction of different parts, joint ranges, child steering adaptation parameters and various rendering options. I thought it would be a quick process, but it takes a couple of hours on each of the mainstream ones; the queer need a lot more, which usually include coding as well. I'm done with half of the current 17 vehicles, only a few won't cut it, I think. The complete game should pack around 20-25 vehicles with varied functions and difficulties.