The spinner is in place now (as per inside cp shot in post above). Arkanoid just became so much more fun compared to playing with the joystick

Power switch mounted on top of the cabinet - just used a spare button and extended the wire from the motherboard up to the top of the cab. Should stop any accidental pressing during gameplay.
Tweaked the IPAC settings a little, I found that when using it there where some occassions where you could end up bringing up the tab menu accidentally by pressing certain buttons at once.
Tweaked the monitor calibration and played with some resolutions - No more rolling screen in vertical games, MK series and in the frontend when the resolution switched

Still rolls around when the windows logo is on during bootup but I can live with that its only there a couple of seconds. Just need to get it recapped to get rid of the jailbars which show up on the darker screens mainly as the new or used monitor is either too pricey or not the right size...
Ordered up some more memory as 256 meg isnt enough for Killer Instinct as its paging out to hard disk and causing framerate drops. Another gig should stop this I think and make it boot and exit a bit better.
Snagged a second hand AMD 2800 XP to replace the 1800, again just for a bit of extra oomph for not much money.
Couple of sets of headphones (Skullcandy GIs) and the leads to split out the connection from the speakers so I can play later and get the sockets mounted underneath the control panel.
The Matrix Orbital LCD seems a bit pointless really, it doesnt add anything to the cab really other than a bit of bling factor as controls are easy enough to figure out IMO. May mount it if I can think of any real reason to use it, possibly as the instruction card substitute for the GameEx controls...
Done some more tweaks to my XP install to reduce it further. Bootup is now pretty quick even with the 256MB of RAM in there. Highly recommend TuneXP for doing some stuff that you normally wouldnt think of doing (move bootfiles location, turn off some unecessary NTFS file settings, tweaks the paging file etc)
Still waiting on the artwork from Scott though

which is a bit of a downer as I cant finish up the wiring, all the buttons will have to be removed when I fit it so they are not solidly in place, the leads to some connectors coming off during play now and then so will be soldering them in place.
May go for a change of buttons and t-molding, we'll see how it all looks when the artwork is in place. Quite fancy making the coin button out of a translucent with the disk for 25c...