SW hit my question right off. You really need to find out what kind of snake it is before you build the cage. You will definately want to seal the bottom wth something. A good 2 part epoxy is nice but expensive, otherwise use a marine grade paint but watch the cure times. The urine from boas is pretty strong so if it gets into the wood it may create amonia quickly. You will also want to create an access area for a thermistat as mentioned for temp control. Find out what he wants to use for heat. What we use to do for the smaller snake cages was to create an opening on the top peice of plywood which was the right size for a flo light to set in. You can route the inside of this opening to inset a wire mesh that the fixture will actually sit on that will prevent the snake from being able to touch the light.
We had several snakes over the 10' mark and our largest was our 17' retic.
We had several snakes over the 10' mark and our largest was our 17' retic.