I got the sliding track as well as the melamine from Home Depot. I dont think the tracks are hard to find.
The dimensions are 4x2x2, but this is a temporary cage. I may build him a 6x2x2, or just leave him in the 4x2x2. Im still building anoter identical cage on top to house my jcp. My jcp was supposed to go where the boa is now, but I figured the boa could use the extra space. The jcp is going to go in this tank and I thought id make a 6x2x2, but I think a 4x2x2 is more then enough for one male boa.
Yes that is melamine btw

Great stuff, but id suggest sealing the corners with silicone incase they ever spill their water dish. Helps the cages last longer.