Oh, nice I've been eyeballing that slipstream. Suggestions? Build you own battery:

https://www.youtube.com/watch?v=b3eRv_FZjBc&list=PLPqn8bOJKP...

And get a Bafang motor:

https://www.utahtrikes.com/PROD-11620438.html

Also I've got a catrike villager