Finally pieced a computer together from my bit-boxes and loaded XP on it. Seemed to be working. Copied over Mala with layout and gamelists. Everything seemed to be working... then MAME refused to cooperate. Seemed to be crashing back to Mala. Tried launching MAME directly from the command line and got what looked like random stretched triangles on the screen. Argh!
Forum searches to the rescue!
I was using the onboard video on the mobo. No 3D hardware apparently and MAME 149 defaults to rendering via Direct3D. There's a command line switch to force rendering via DirectDraw that fixed the problem. Amazingly enough there is at least one forum post on these boards that talks about this and how to fix it. Yay!
So, now that the computer end of things is worked out, I started mounting everything inside the cabinet. Considering that I'm using older desktop PC parts I'm having to get creative in my getting it all mounted. Whipping out those mad Tetris skills.
My brother is in town this weekend and came by to visit. He loves the cabinet and can't wait to take it home. Overall, I'm chalking this up as a success.