Now onto the ESC
Here is the ESC I'm using I bought it roughly 10 years ago so I don't know if its still sold, but it probably is under some name.



The ESC is actually small enough to now fit between the chassis, and the plate I bolted to the bottom without getting near the center driveshaft so that is where it will be.
No picture as you literally can't see it when its installed all you see is the wires.

Now that is what I did today I hit 3 bumps in the road.
The 1st one is VERY minor, and can be fixed. That is the wires are too damn long I can easily cut them, and redo them.
Next one is the RX doesn't fit on the side properly. I could probably narrow the walls down for the tray, and re print it, and it would squeeze in if I took it out of its case. This isn't a big issue.
The not so minor one is the Lipo I was intending to use is a bit too big to fit on the side, and that is if I remove the wrap, and protective stuff leaving just the plain cells. The max size the battery can be is 15mmX44mmX30mm

Edit: I could go upto 55mm's with a redesign of the tray, but the other 2 are kinda set. I found a few batteries that could potentially fit, but the shipping on them would be more then the cost of the battery, and they are all in the 500mah-900mah range