So acquired a HL T-34/85 tank whose purpose was to be my prototype upgrade test unit.

I've gutted the battery box and epoxied in two hull stiffeners.
Discovered that while a heated exacto blade (Via soldering iron) allows for very good fine cutting control, it is very slow and tedious.... Being able to heat up the blade and just plunge cut through the thickest plastic portions of the hull is damned satisfying however... After 20 minutes of carving I stopped, hooked up the dremel with the router attachment and set my cut depth to have a uniform cut from the lower outside hull. Worked much faster... Way more mess though (dust/shavings).

Over the cut-outs for the swing arm limits I put in some C channel plastic to allow a good clean pour of resin for additional stiffening at the motor mount area and to create a nice smooth mounting surface for boards/battery/receiver/etc... (Resin pour will hopefully be tonight...) I did find my C-Channels stick into the hull too far to allow the motor/gearboxes to mount properly so I will have to trim them down...

Images will follow later.

Scuffing via some sandpaper just to have some surface to stick to
Plan is to have a thin amount of resin covering the rear (non motor), and center portions to have a nice smooth mounting surface. For the motor mount area, Pouring the resin to be even with the tops of the screw mounts is the goal to have a solid firm base for the motors. (And to do bolt through chassis if need be).
The last image shows the two c-channels that will need to be trimmed down to allow the motors to be installed... Sigh...

You were smart to put the bulkheads in. In my PzIV the resin shrunk and pulled the hull sides in.

knispel wrote:

You were smart to put the bulkheads in. In my PzIV the resin shrunk and pulled the hull sides in.

The resin I am using has some really high thermal action (Gets hot while curing...).
My first time using it and wasn't sure If I was doing it correctly.. Was also worried that the hull plastic would warp... Need to layout some parts next... Do I use double sided tape or make housings to glue in (aka a Clark board 3D printed box to glue in and screw the board to).