Thanks guys!
The orange parts are 3D printed by Jonathan, I believe the material is PLA: it didn't smell like ABS when I shaved a little material off here and there during the build, it's smelled pretty good actually. No wonder, PLA is a bio-based (and biodegradable) plastic - so I better clean the car well after every race
All in all though, not too many mods were needed to the car to get it ready for it's first test drive. I've already driven it (on tarmac, I have no nearby track or good dirt/astro surface) - it seemed to be going really well, though I think more 'buildup' of negative camber on the uptravel of the suspension would be a first step to help increase acceleration through corners. If I have more grip on the outside though, I need to reduce roll (as much of the power is already going to the inside wheel on the corners).