Don't know if this is of any use but I mocked up a control panel out of some spare MDF a while ago, with the idea that it would be removable and interchangeable. It never got past the mock-up stage, but proved the concept.
The way I achieved this was by screwing a piece of angle steel ( basically inverted L shape) to each side of what would be the cabinet chassis - these angle pieces have holes drilled in them, with a thread tapped into the hole.
The control panel "top" then has corresponding holes drilled through it, and it simply bolts through - I used polished dome headed allen bolts. The sticks and buttons are terminated in plugs so they could be quickly removed and reconnected to the cabinet harness.
It was fairly robust - I didn't managed to break it with some fairly forceful pulling and pushing.
If your angle steel isn't really thick enough to get enough threads tapped in it, you would always weld bolts to the underside.
See attached pic. The circled bolts hold the control panel to the angle steel. Also, notice how my dog managed to get his ear in the bottom corner of the pic!
