Nice upgrade, very similar to mine.
If you place the RX14 & receiver boards in the turret you will not need to waterproof the hull.
The space this frees up in the hull will allow you to move the batteries so that the forward edge is level
with the center of the second road wheel. This will give a better ride and improved traction.
An easy way to hold the batteries safely in position is to use packaging foam.
The gearboxes on my Leo are mounted on a base plate which allows me to alter track tension.
I've also fitted PzIII shocks to the first and last road wheels.
I will be fitting a laser diode this week connected to the HL machine gun circuit. This will act
as a target designator during IR battles.

Cheers
John