I'm in agreement with Fasteddy on this one.
1.) You're putting a lot of eggs in one basket, so to speak, That Power supply fails and you are up a creek.
2.) I went the PC power supply root and thought I had it nail.
a.) Power fluctuations made the power supply shut down
b.) One did...
There are 5 videos in that series, One explains the construction.
100 Pixels each
20 feet of pixels
25 feet (7.6m) arches, more then enough for a mini van to drive under
2 SanDevices E8604 controlers