Convert Scenery Object To Loco

As a joke I want to convert a normal scenery asset into a driveable loco. I tried watching Matt Peddlesden's video on it but I couldn't get my head around it. What would I need to add to the scenery object's BIN file to make it work? Or would I have to create a new BIN in a different file location?

 

I think you just copy a real loco, then replace the geo directory with whatever you want.