I'd been trying to think around a need for fuel or engines, in the case that they be needed here, or simply due to the cost and limited availability of fuel at home. It'd present a further challenge for mobility if the user wasn't able to power it themselves, by some means.

( She hums, thinking. )

I've done extensive repairs and restoration of machines. The mechanisms I've created have been weapons, rather than complex vehicles, but that's my passion. I've developed designs, but that was for my own enjoyment, the work I've had to do has been more focused on maintaining and adapting existing machines for civil projects.