Great project!! Love the hover board!
In my experience with trying to photograph models inside, I have found the most consistency with four things:
Using the Macro setting, along with the 'indoor' preset (I don't use 'auto' if I can avoid it)
Using a tripod (no camera shake, or distance change)
Using the timer (no shake from the shutter button-I'm not touching the camera when the shutter clicks)
Using a spot light for lighting (I found one that gives nice even lighting, not to harsh, and not too orange)
I have a garage diorama that I use as a background for pictures of my models. I have a spot light above it, and the tripod in front. Getting pictures of a small subject like models, and in tough lighting like indoors, it is tough to get reliable pictures without experimenting and finding what works for you. I did use a piece of white paper (like a sheet of bristle board) as a sweeping backdrop (two corners on the wall, two on the table top in a sweep so there is no visible line between the table and wall). You could use a sheet, or something like that for the same effect. The light is the main thing, as a flash can be too bright that close, so a diffuser or a remote flash could be used.
I hope that my experiences in trying to take pictures of my models can help. I am no expert, but I've tried a few things, and have shared that learning here! Good luck, and I'll be looking as you get through these three awesome cars!