I have a white Vectrix VX-1 that was converted to Leaf modules by the previous owner. I didn't see the BMS mentioned in that first vid, but I'll take your word for it.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.