Created seperate file for the lower base plate
Added drilling template for the booms

Also renamed the lower base plate file.
Added the upper base plate
Added drill holes for battery mounting plate
Created a simple plate for mounting the battery.

With the screws and the landing gear on the bottom side, I needed an even
surface to attach the battery to. In case of a crash, screws, nuts, etc.
now won't directly punch into the battery.
A plate that goes on top of the electronics tower