You can do the 4' X 2' X 1' tall method like the boaphile. It's going to be a long time before you need a big cage though. If I were you and I only needed one, I would save up for the boaphile cage or the visions cage:
http://www.boaphileplastics.com/
If you insist on making a cage then check out the cage builders forum:
http://cagecrafters.com/forum/
If you want to know how good a cage can look check this:
http://www.terra5designs.com/
Personally if I were you I would find out about heating lighting humidity temperatures first before spending money on building materials. I don't know what a cement tub is, but if you can't heat it properly it's useless. Lots of new owners use aquariums. I got a few of them free myself. Maybe someone will give you one even. I wouldn't be worrying about it now until you understand the heating requirements too for your new pet.
Caden

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