Ok, finally after like 6 months I got ahold of my Stargate cabinet.
As you can see in the picture it is painted over, converted to Trivia Whiz and empty. I was supposed to get a marquee and coin door with it, but they seemed mysteriously missing when the cabinet was delivered.
The original sideart can be seen underneath the black paint (which seems to scrape off really easily too).
I already have a Stargate panel to go on this machine.