Here's the deal. I love the Hotrod SE because you can just plug it in anywhere and start playing (I'm putting an IPAC VE in it to make it even better). I wanted to use it on the cab I'm doing (old Kangaroo cab), but this would eliminate half of its appeal to me. So I want to make a system where the Hotrod can attach to the cab, firmly, and be somewhat easy to remove.
If I get that worked out, great, but it would leave the cab looking terrible when I took out the Hotrod. So I had an idea. I once considered making an old school cab for Pacman, Frogger, etc. with just a 4 way joystick, a couple of buttons, and maybe a trackball. What if I were to make this CP, and keep it inside the cab like a sliding drawer that easily goes in and out. When I want to fire up SFII and MK with the Hotrod, I just slide the other CP in. When I want to use the Hotrod somewhere else, or play some 4-way games on the cab, I take the Hotrod out and slide the 4-way CP out.
Here are some sketches of what I mean:



Does this look feasible? Any suggestions on how to go about this? Should I just scrap the whole thing, keep the Hotrod separate, and make a big dedicated CP? (Keep in mind this is a small Kangaroo cab, and I'd have to learn wood-working from the ground up if I went that route)