How much to make a 1000W+ fat ebike?

[thegutterpoet]

I am completely new to ebikes, though am keen on making a 1000W+ ebike with fat tyres. Happy to try put the pieces together! Likely need pedal assist as well as option to use solely the motor.

Can anyone explain what I need and suggest options?

I am based in Australia so will be ordering by mail!

Please help!

Cheers!