Unique amongst the entries! I actually had the thought of “hm maybe I could have done a car customizer entry” and then I saw yours so I was excited.
It felt a bit random each time I passed through what I’d get, which I guess is part of the point. I think it could have been interesting if as you approached each checkpoint, er, each set of check”boxes”, having a UI hovering over saying which one each was, could have help you strategize more. And if not the specific item, at least that “category” of which box relates to what, so you could avoid getting a lower tier engine if you think you already have the best. All the same, nice work.