UMX P3 Revolution battery tray

Was not satisfied with the standard foam boad for mounting the battery inside my ulta micro e-flite UMX P3 Revolution: it had too much twist.

So I decided to create my own matching part:
- the hole on the left front is for the motor cable (disconnect ESC and motor to push the wire through it and reconnect them again)
- the hole on the left back is for the battery cable adapter (just push the battery connector through the hole)
- is capable of default eflite batteries (200mah 2S) as also po