I just built two.
Pre-tap all the holes before you put any of the ansmann screws in otherwise the heads will strip. I found that the heads strip just from looking at them too hard. Better still get some decent M3 screws...
You should get a bearing set from somewhere like
www.rcbearings.co.uk otherwise you'll have to use the brass bushes supplied in the kit.
I found the front suspension needed a little fettling to free it up, and the front hexes will probably bind when you tighten the wheels up.
Overall though a very enjoyable build and excellent quality (apart from the screws) kit.