Welcome to BPNet! Here's a link for the DIY for plastic housing.
http://www.ball-pythons.net/modules....warticle&id=40
It is a great permanent housing option for a BP or even a temporary one while you design and build a custom enclosure.
Here's a link for some great information about glass tanks for housing BP's in.
http://www.ball-pythons.net/forums/s...ad.php?t=32800
If you give us an idea of what you are wanting to build I'm sure someone can give you some advice or links to look at.