When I built my docking station, the only change I made to the actual sled was to bend the tabs that hold it in. With judicious use of the screw thread, perhaps even that could be avoided.

Power plug (unconnected, but needed to switch the player to AC mode) and ethernet are held in a block of wood carved to hold them. This block is tight in my cage, but it could be secured with a bolt to the existing mounting nut if necessary.

All wiring uses the connectors on the harness - ISO connector, audio jacks, D-connector, etc. It meant spending money on extra connectors just to extend them to the case, but I thought that was worth it.

So I didn't cut any wires or drill any holes making mine. I'm pretty confident I could take the cage out in an almost-new state (with just the bent tabs and some slide marks to show it's been used).

Sorry I have no photos. If I ever get myself a digital camera, I'll see what I can do.