To the best of my knowledge no one has really attempted to do this. If you want to give it a try I can 3D print plastic parts for you if you need the help.
I have a used ESC and Motor that I'm planning on departing with. I can give it to you for 120bucks with split shipping if you are interested. I am planing on adding a 1/5th scale motor on mine ( evil smile)
Bigger is not better. Bigger motors tend not to rev as high thus giving you lower top speed. I had the LRP .28 on my racer and i loved it! I would also suggest using the Picco .28 it is also another awesome motor.