New Mid Drive option 5000W - where to get a battery pack ?

Just saw this being launched by Watt Wagons
https://wattwagons.com/collections/labs/products/bafang-ultra-with-archon-x1-labs-edition

Looks like they are offering Bafang Ultra with 3000W nominal, 4000W Nominal, 5000W nominal !

There are a ton of disclaimers and no warranty...

I am curious if someone can build a high amp 52V pack to get this baby moving? Is EM3EV a good vendor to build something for this ?