Tell us about yourself!
It's a good idea for first look, but it doesn't work for some reasons. Electric potential appear between the aluminium cap and the lye, so if you cut the center of grid, you only insignificantly increase resistance of grid (electric power don't flow's as you draw, it it accumulates on the entire working surface).
Control four motors without the driver? You're so risky, man. Why not to use four NPN transistors for removing heavy load from the controller? And, with transistors your drone will fly faster and higher.