Mmm.. sounds easy enough to do. Heck, you could even just biscuit one up from MDF in an hour or so.
The RCA jacks on the unit are the tricky bit, as one can break the player if the mating plugs don't have sufficient wiggle room.
I recently got a couple of mating connectors for the docking connector specificially for such a purpose: so I can build a dock or two without needing a sled (or two). I hope to use the docking connector to supply audio out (instead of the more fragile RCA jacks).
But.. summer calls..
Cheers