I presume as you have chosen a 1/12th scale as you want to race, and that you have found a club close to you that actually races them as not many clubs run 1/12th.
If you are planning on racing you are better getting something more suitable than the Kawada. The biggest problem is the wheels, which means having to mount and true your own tyres as standard wheels don't fit. Another problem is the UK now races with a single cell 3.7v lipo battery, which will only fit in the Kawada if you tape it in down one side and try and balance the weight using the radio gear on the other side. It does work that way, butnot as well as a car designed for lipo.
For bodyshells for any 1/12th, if you are planning on racing then the Protoform AMR-12 is used by almost all UK racers. You will also need a 10.5 turn brushless system, the 10.5t motor is used more or less everywhere. You can find the rules we race to in the UK here