Talk to the guys at Luna. You are really building an electric motorcycle. They have a lot of builds in their forum/website. Look for a build that has worked before and copy it.

Why are you going Fat? Snow? High speed? I would go to a regular 27.5 size if you are just after speed. Tons of tires and bikes available. The only reason I would go with fat tires if I was going to ride in the snow. I have done a bit of snow riding and I'm not hooked on it with an ebike.

You are not legal riding this on most mountain bike trails either---only motorcycle trails.

Don't attempt installing this kit yourself. (I have listened to your questions to get to this suggestion) Find a bike shop mechanic that is into ebikes (talk to them) or someone that is really into ebikes. It is a full afternoon job for a good mechanic.

Tons of power through this system.