What does the Fazuaarrgghhh! weigh, and is that weight manageable?
Here are a couple of "New old stock" Taiwanese unbranded aluminium mini velo frames on ebay. The first one has 135mm rear dropouts, which might be the right size for the Crusa's rear hub motor - you'd have to upload a photo of the Crusa's motor, for our hub motor experts to identify it. Detailed photos are on the listing galleries. I don't know which forks would be compatible.
Bargain Price NOS Item! • Wheel Size - 20".
www.ebay.co.uk
You might be able to get a BBS01B installed on this, but BB size isn't mentioned. 130mm rear dropouts, therefore unlikely to be compatible with the Crusa's motor IMHO. Rear hub motors usually require 135mm spacing:
Bargain Price NOS Item! • For Rim Brake Caliper Only.
www.ebay.co.uk