Thanks for the info!Pasion Ebike is run by a lady named Wendy Xie. She's pretty well known in some ebike circles as a community member early on - nowadays mostly a vendor. Her company is the USA supplier of parts for at least a couple of popular ebike companies most USA riders have at least heard of. In the early years of the Sondors ebikes, she was the one who figured out how to give owners amp'd up parts (controllers, displays) that let owners turn underpowered bikes into hot rods.
I would classify her as one of the good guys. She's one of the few vendors I would buy a battery from (if I had to buy from China), although not my first choice. Look at her 30ah pack and note the size of it vs. the size of your triangle. The battery and wheel kit could turn into a 1-stop solution for you. Battery plus kit would be US$1300. Select UK shipping on the lower left hand corner of any page on the site. Its still in USD though on purpose according to the dropdown that denotes USD for everything.
She uses quality parts. That LCD8H is probably the best KT display available. And notice how the bigger wheels use MTX39 rims. I use those on my cargo bikes, and would have used them on the compact emtb I am building if I could have just gotten hold of a set (I used DT Swiss FR560's instead). MTX39's run at least $65 each retail. So she's using good parts in those kits.
edit: I have bought a bunch of stuff from her, albeit mostly throttles and sensors and displays. I did buy a G060 cassette motor from her a few years ago.
Just spotted though that their cassette wheel is 145 mm wide and my bike is 135. No question it can be spread 10 mm by force, but I would be hesitant to apply that constant bending force to tubes and welds in addition to everything else it will have to take.