I can't remember if there was a response, but I seem to remember someone inquiring about whether it was possible to get pre-cut / -scored punchouts on the back for RP-SMA antennas, did you ever get a chance to look into that as a possibility?
(Example, the case for my router had these holes on the front of the case for more antennas):
I probably wouldn't initially put a wireless miniPCIe card in, but it would be nice to have the option to at a later date.
(Example, the case for my router had these holes on the front of the case for more antennas):

I probably wouldn't initially put a wireless miniPCIe card in, but it would be nice to have the option to at a later date.