GUYS I NEED HELP.4ft x 8 ft lighted pixel box

so i was tasked to create 2 x lighted box signs dimensions 4ft x 4ft one above another. the problem is. its sort of slanted in a 45 degree angle. and not directly above eachother.
i need to program it to play random patterns from any part of it example patterns starting from the middle instead of the end.

im using ws2812 strips and i dont know whnere to buy a pixel blaze. or which one to get. any help will be appreciated

Check the ElectroMage website for some more details. There are docs on making 2d pixel maps. You could run your LEDs just about any way you like. Either model would work for this.