The computer was a very nice fit inside the cabinet door.  It gave just enough room to allow the CD tray to open in line with the door frame.  
computer1.gif (74046 bytes)
The PC:

TYAN 1854S Motherboard
Intel Pentium III, 866 Mhz CPU
512 MB PC133 RAM
2.5 Gig Western Digital HD
Diamond Viper 770 using the Nvidia Ultra TNT2 with latest driver package
Standard 16X CD-Rom
Standard 3 1/2" Floppy 

The spinner is plugged into the Serial 1 port and the Serial 2 port is disabled.
Also disabled is the LPT1 port.  I did this for no reason other than that I could :)

I have two fans running in the PC aside from the CPU fan and the Power Supply fan.

There is also a high-flow exhaust fan mounted in the pack of the cabinet running off of the PC's power.

 
Using the PC's 12v power source is something to consider, especially if you're planning on hooking up the Coin Door lights.  They run off of a 12v source.  I wired in an extension from the door and bought a male-end Molex cord.  Then I spliced the Coin door leads into the male end and made a quick disconnect for the lights.  They are running off one of the PC's power sources pushed through an open Bay slot in the back of the PC.  I felt this was the simplest and safest way to power the lights.  Since I had no use for the extra power cables in the PC, it worked out great.

When the photo above was taken, I had a HP CR-Wr installed for software upload. That has since been removed.  The PC is purely bare-boned with nothing fancy.  Just the basics to run the emulators.