So are you going to try and run 2 copies of mame on the same computer and then send each emu to a different monitor? That would be neat. Either way, are you sure that two 19" computer monitors will fit in there? PC monitors are alot deeper than arcade monitors.
I would recommend you only put the Vs. games in it. Then you could tell your friends that it is an Ultra-rare multi nintendo arcade machine. They won't know the truth, and your geek..I mean cool status will go thru the roof! Yeah! 
2 mames on 1 PC no.
I do have a video card with 3 out puts though
2 vga and 1 svid
another card with 2 vga out puts
another with vga and svid out
That is iff I was to use PC monitors
I have read other used Arcade monitors with normal PC cards
I think I will use 2 PCs and check into arcade monitors but if it gets 2 hard I will see if 2 PC monitors will fit. It should hold them both... this thing is Fricking huge and lots of room.
Just at a glance inside I think 2 19 inch PC monitors will fit with out even tacking off the covers
I will see if I can find my card reader and take some pictures
post back in a few if I can find my card readers. All my crap is in boxes.
as far as PC's have more than I need... I was going to build atotal of 7 arcades but Wife wanted bigger living room. She bought me all kinds of power tools and WHAM 3 walls are now gone. I have a very large bed room a Large living room but I must pick my 2 arcades
Ms Pac a must.... Hmmm Nintendo VS = another 2 . OK I cheated and have 3
