This is made from PVC pieces, you can get at most any hardware store. The ends are bought as is, and you may be able to get some short lenghths of the straight piece and cut to length.
I know the parts are from a hardware store. It's the insides, I want to know about.
I made a larger version of this cache. Try searching for "Monkey Cache" if you dont have any luck let me know and I can help as best I can.
Is this what you did on the inside?