I decided to post this here, as well as in "Project Announcements"
Using the XBOX 360 controller for most retro games sucks, IMO. This unit has an Ultimarc Magstick Plus and Happ buttons in it. Here's some pics of the process:
Here's the pieces of the kit. I laminated everything with black Wilsonart.
All glue, no screw!
The unused hole is hidden beneath the laminate.
I glued some corner blocks in to mount the control panel deck and bottom cover to.
Here's a close up of the t-nut installation. I later Bondo'd over the top of the t-nuts.
I didn't like the idea of drilling a hole through the box for the cord, so I used a usb pass-through I had. The hacked 360 controller plugs into it on the inside of the unit and an extension plugs in on the outside.
Here's the finished project!