I have a small Craftsman 1 gal compressor, and decided to try to fit it in a SYS-V. It already gets transported in the SYS, so I thought I'd make it more permanent so I could stop taking it out of the box.
I had to cut off the roll cage, and mount the compressor on risers so it could sort of wrap up and around the tank. I reused the threaded holes from the feet to bolt the tank to the plywood base. I mounted the rubber feet from the compressor frame to the bottom of the plywood insert, and it all fit!
Then, I discovered that it would actually fit in a SYS-IV. Unfortunately, I had already drilled the holes for the hose and the drain in the SYS-V, but I moved it into a IV anyway. The pic shows it in a SYS-IV with the MFT top. I moved the MFT top to a different SYS, my Hand Tools box, which is coming along nicely.