That's awesome man!! I'm waiting on my kit from GRS tp arrive. Couple of questions:
1) what were you laying down in the speaker/marquee area.
2) what LED strips did you use and how did you wire them?
I like the Mars Attack theme, very unique!
Congrats, you will love it! What did you end up going with for artwork?
1) I put some aluminum HVAC tape inside the marquee box, and then I cut and covered a piece of cardboard to mount the lights to. I had bought the tape from Lowes for another project a while back. It was probably overkill, but I thought it might reflect the light around the marquee so that the light is distributed out evenly.
https://www.lowes.com/pd/3M-1-88-in-W-x-150-ft-L-HVAC-Tape/40096032) The LED strips actually came with the "Guts mega pack" from GRS. You can get the same lights from Amazon, as well as the power supply to run them. They're pretty simple to hook up, just connect to the 12v power supply and then plug that into your power strip. So they turn on when you switch on the power to the cabinet.
http://a.co/7PVZM8r http://a.co/bwo9i0E.
Just a couple of things I noticed with my build. First thing is, I used all 16.4 ft of lights with my kit, and quickly realized that it was too bright. I ended up throwing in a dimmer I had laying around from when I put similar strip lights under our kitchen cabinets. If you install them the same way that I did, I would recommend only using 8 ft of lights. Second thing is that I played around a bit with the placement of lights, and found that if I covered the entire piece of cardboard with light, the speakers would cast a shadow on the marquee. I found that if you start your lights about 2" from the bottom of the cardboard (the depth of the speakers) I got excellent light coverage without any shadows.
Hope this helps, let me know if you have any other questions.