Vesc6.6plus, 2 6s batteries, and meepo 100mm motors

Trying to figure out how best to get this setup together. I have a 3d printer, and I have a nice dual 6s charger I am looking to find the best way to set it up to run it as 12s and still be able to charge it as painlessly as possible.

can we see some pictures? might help us come up with a solution

Is there a problem with the meepo battery? If its the 40t pack you should just use that.