Looks really good. A few questions that will help on my build, if I may...

- Looks like you raised the sprockets by about 4-mm. How much did you lower the rear return rollers?

- How did you wire the charging port? I've looked at the stereo option, but I'm not sure how to wire it (in the tank and on the charger) and then include the on/off switch. Any concerns with charging the two batteries together (I assume they're in parallel to the TK board)? Or, do you isolate them while charging them? Would love a circuit diagram or wiring diagram for this mod. There are transmitter charging leads that I've considered using for the charger side, but wouldn't know how to wire the tank side correctly (proper placement of positive and negative).