I had a Kawada 1/12 many many many years ago, played it just a few days and give up 1/12 forever, 1st it's very difficult to play good, 2nd football court is 1/12 killer, 3rd no carpet ground, 4th shell damp ugly!
灣仔橋底, you need 3 things:
1) 'ghost' tires, this will give you grip at the track
2) good skills, because the area is small and there are concrete barriers
3) need to clean car every time you play there since its so oily there