If weight is an issue the rimfire is heavy 1245gr 44oz. A scorpion S11-5535-190kv is 906 gr 32oz. Just something to consider. Although price $249. rimfire $359. Scorpion.
There are a lot of motors to chose from I think 5000 watts about 180kv to 225kv. 10 to 12 cell battery
Is there a good way to get the batteries out for charging?. The mustang I have is going to require some hacking to access the batteries. I'm still in the thought process.