Will do Don, it's not really that complex when you keep the second pack completely seperate with it's own Charger/Inverter/water cooler and BMU/BMS/ECU (Coming form a stripped down 2012 that got a new battery and charger). All you have to do is bridge the 2 inverters on the 360V (fully charged)...
I've completely stripped a working 2012 Miev to build a "power pack with heater and colling" for a van conversion but cancelled the project so I have a battery in great condition (replaced with new model with LEV50N I've been told), a 2017 charger + dc/dc converter, heater with pump, AC pump...
luvmymiev, I have an almost new 2017 charger available from a miev 2012 if you want to replace yours, let me know if interested and how much you're willing to pay (via pm).
I'm in Quebec Canada and could ship it to you or we could meet neaar the border as I hike often in the white/green mountains.