On my project, I am using PSX controllers to be able to use with PS1, PS2, PS3 and PC (MAME, etc...).
When in use on the PS3, I want to use my LCD TV and not the TUBE I have for my cabinet. For the stand for the CP, I am going to fabricate something that will allow me to utilize the drum stand for rock band as the main stand. Then just plug into the PlaystationX system and Street Fighter 4 / Tekken 6 is on!!!!
Then, for the MAME, the CP will connect up to the cabinet.
There are also "retro collections" you can get for the PS2 which I will use as an alternative to the emu stuff.
I can't wait to see some pics. Sounds as though you are better than half way there.