So, after tearing down part of that wall we needed a safe way to store the equipment. It also has to be a bit above floor level, as we plan on making a small stage.
For the base I used some C channel iron. Parts of it were a bit mangled, so I made a makeshift tool with an hydraulic jack to spread its sides and have a good fit.
The top is simpler, it just needs to hold the vertical struts in place and the light fixture.
Then I centered it on the base and proceeded to punch and drill the holes to locate the rest of the structure: