hmm, it still took me a good 2 hours from start to finish because i was planning out the design at the same time! the wheels look good because i spent a lot of time cutting off the bitter white parts and shaping them to be symmetrical and wheel-like! carving doors/driver seat was another 20-30 minutes. the mice were definitely the easiest with only peeling and sharpie art.
for a kid's project, i'd sub green ribbon curled with scissors or green pipe cleaners then draw in the doors! that'd make it a 15 minute project but not as fancy as mine was. ;)