Have been over those solutions a couple of times already and there is no space left. First up I did a "tunnel" with 2 CF plates attached on each side of two 4mm*6mm brass U-profile that worked as top/bottom.
The problem was that there were not much material to make the threaded holes. Too week. If I only had a 4*4mm brass. It would be just perfect and a lot more space inside. Could not find that thin. Only 10*10mm

. Perhaps I will make them myself at a friends house to solve this issue.
My workshop is my kitchen. Only tools available is a Dremel and a hand held drilling machine.
If I want to replace the motor or something else I only have to loosen the two screws on the back bulk underneath. The front only has one screw so it can be turned
This is how it looks. Probably going to use thinner cables. This has A LOT of isolation!