Ok, we did the first test run with my sons Rusty. We had MM esc, Ammo 36-56-2600 motor, Maxamps 11,1V 8000 mAh Lipo, stock spur and 20t pinion. I had to seal end of the motor because of those huge holes in it. After about 15 minutes driving, the motor was a little warmer than my hand, esc did't heat at all. At the time of test run, it was 0 celsius degrees so I have no idea how the motor performs in summer. We'll see that in 5 months.

F***ing winter.
There were no cogging or any other problems, so I was very happy with the car. The speed is quite ok to me. Maybe I'll have to try the Ammo 36-50-3300 motor too, but I think that 2600 kv motor may be better option with 3s Li-Po?