Conducting Power on a Scratch Built Chassis

Update: Sure enough, I was able to power one of the drive units with an aluminium foil strip (only touching the terminal that sticks out). Now I'll just have to find how to incorporate one into a custom chassis and have a piece press the terminal down on the foil like in the official "Thomas type" locos. The rails have been laid for the construction of not one, but two new running models with custom frames that could coexist with each other. The second DU is currently missing the switch spring and will need some minor repairs before it could be tested. Hopefully this could also facilitate building a similar DU to the "Clam Shell" and old Plarail standard, given how the wires look like they could be made from safety pins or another thin metal rod. If I could harvest the "Thomas type" from the powered ex Annie, I could've had 'three' operational custom units at the same time. Many frames I'll build for them will be modeled after it to get the same length and look and make up for how the original is (currently) defunct. It should also help me fulfill the plans I had for the original until its battery pack came off.