I am writing this on my Kindle HDX (with keyboard) that Linda got me as a surprise gift--no pressure for her upcoming birthday--so I can now bring my camera to the Nerf Fab Shoppe diorama rather than the other way around. BTW, I discovered some scale rubber tyres with fine plastic wheels at the local hobby shop's science project section. The Stevems International products are 11mm, just the right size for my 1/43 Heller Mini Coopers. I also picked up[ some 18mm set ups which size perfectly to normal sized 1/43 vehicles.
Also stumbled upon some Dollar Tree metal Erector Set-type shapes which look like the will serve as frame extenders and motor brackets. Check out the bottom shelf of your local DT for this kind of mini-robot kit.
Nerf