Hey there!

From a Middleweight perspective, if you wanted to have a brushed motor setup, you could use a pair of 500W (or even 350W I should think) scooter motors and a Cytron SmartDriveDuo 60A as a drive ESC. Very simple setup.

Batteries are largely the same as you'll find in Heavyweights, just a bit smaller. I used 8S 4200mAh LiFe batteries in Jibril which are fine for one fight and then need charging so anything north of that mAh capacity would be suitable.