So I've been thinking if I need to start building a 421d cage like the Boaphile 421. But the thing is that I have heard yes and no's that I may not need to build a 421 being that I have a 42qt rack system already. Now I have two Hog Island and am about to add a albino baby boa to my collection. I just dont know if I should start to build a 421 and I was wondering if you guys knew any good articles or threads on this site or other sites that I can build this type of cage with pictures and directions. I have all the tools just need to know what type of material and whats the best way to go at it thanks a bunch.