Good luck finding a marquee...or any of the artwork for that matter. Pretty hard to come by. Not sure about the brackets - it might be easier just to construct something yourself.
In terms of the joysticks, I'd recommend just rebuilding them. It'll be much less expensive than buying new joysticks (happs sells them for $200 each.) I just finished rebuilding all of mine. It's mostly a lot of time spent taking them apart and cleaning them. You'd be surprised how filthy the insides of these joysticks can get. Other than that, there isn't a whole lot to rebuild. The major components to replace are the two pots and the main bearing. Betson sells replacement pots for $8-$9 each. You can find the bearings at any store that sells bearings -- they're a standard size. Then pick up some nyogel and lubricate each of the four joysticks. Boom! Done.
So for about $20-$25 and some time, you can have yourself joysticks that are practically in new condition. These sticks are VERY robust/rugged and meant to taking some abuse. They'll last you a long time.
P.S. Don't forget to test the pots in the test menu and reset the limits after you've rebuilt the sticks.