Brushless Cen Genesis

[Hardstyle]

Thats the way to do it, if you want to keep the stock gearbox. Nice start.
About the gearing. Like I said before that two gear pinion is quite pita. (Expensive and rather hard to get different sizes). I would suggest you to try something what jzemaxx did. He locked the gears so he have to use just 1 pinion. Dunno if it works on 3 speed gb though. jzemaxx owns nemesis which has 2 speed box..

Just my two cents