You are trying to do it the hard way.
There are kits to take a Tesla motor and bolt it in place of a V8 in a traditional car. Right now they are set up for the most common small block chevy and turbo350 but could be anything. I lost track of how many conversion companies there were set up at SEMA last year.
The Mach-E is a little too new. The Motorsports motor is nothing special, just a production part sold through Ford's aftermarket line. They have barely been out. There is not a steady supply nor inventory of cheap ones for people to play with from wrecked cars.
The motor and invertor installation are the easy part. The electrical is what is the complex part. Between trying to package the battery packs, dealing with the charging circuits, the whole communication of everything. That's where things get complex.
I'll make it easy for you. Just show up at Barrett Jackson this coming winter with a fat checkbook. There will be an early Bronco going across in a charity auction that will be an EV.
These are from last SEMA. Tesla conversion
These were done with Torque Trends.
The Ford show truck of the Mach-e powertrain really wasn't that good. They took a Mach-e and removed the body and shoved all the parts into an F150. The dash, the steering column, everything. If you know anything about dent side trucks and look at the inside and your first though is "how is this even drivable?" To shove all the parts in the steering wheel and column are placed where the packaging lets them fit, not where it is drivable. What it really shows is how unforgiving the adaption of parts really is. Go back a couple decades and someone trying to swap an Explorer V8. You pretty much had to transplant EVERYTHING and that is now a fairly basic swap now that it is known. The level of electronics has seriously ramped up in the past couple of decades. Everything is tied to everything else.
Yes, you can get a cool EV motor for cheap out of a catalog. But for the general gear head, there is nothing you can do with it. The motor is one of the simpler and cheaper parts of the EV swap.
Yes, this stuff will get simpler and more swap friendly. But we are in the early days. And the Mach-e stuff is too new and rare to do anything with at the moment. 5 years from now, when there are a lot of junked Mach-e and Lightening pickups. Someone finds a way to control the powertrain without the full integration of all the electrical systems. This stuff will get swapped into all kinds of things.
Battery technology has come a long way in the past decade since EVs first hit the market as a mass production vehicle. But they are not done yet.
I have a fair bit of experience in this stuff. Not allowed to go into too much detail, but a lot of my handywork can be seen in this
picture.