very cool of you to save that big blue.
That's a gen 1 big blue, and luckily they have recently reproduced those pesky metal control panels. I can try to connect you with the guy who reproduces them. I think they are about $150 shipped.
The q sound amp set up is going to be hard to find. There's some on ebay from france, but they are priced pretty high. Also, gen 1 big blues did not come with Q sound. It was just gen 2 and gen 3 with the oversized control panels.
Any switching arcade power supply should work. Does that cab work? Also those marquees are reproduced. I got mine from ebay, had some plexi cut to size at home depot and it worked well. Let me know if you have any questions, I love the big blues and have restored a few now!