Yeah, both are proper model kits. Still haven't finished Formula though, sadly, had barely any space in my old house, and I've only recently got some proper tools. Gonna try looking for some paints while staying with my brother, supposed to be 3 model shops in the main town.
I'm guessing the KOS-MOS you mean is this one?
http://www.volks.co.jp/jp/charagumin/chara39.html/
Had it for about 2 years in the box and still haven't started. Too scared to mess up somehow. The parts are all off their runners, but the gates are still on, so they need removing and a bit of work. I'll need to look at the way they fit and start with the gates that end up hidden.
Hopefully it'll get sent out soon.