My son wanted a rainbow space car with big spikey wheels (that was pretty much his exact words).
About this creation
It's a pretty horrible car. My boy wanted the engine from my S13 Silvia build (the only part of that build that I didn't dismantle) and he attached one of the huge Atlantis set propellers onto it, as seen below.
The bonnet lifts up, but it's heavy as and not really joined on very well (4 year olds get impatient and proper build techniques can take too long!). He added all the pipes and grilles and the fire etc at the end
The build looks pretty horrible, but is relatively stable apart from the bonnet hinges. The boy is happy and that's the main thing.