Are you planning on housing them together?I know one of the forum members Ericsorgs keeps his male in a 8'x8' I believe? I have 3 baby ousties from him and once they get bigger, I plan on making something like 4x7 or 4x6 for each of them. I may go 3' wide but not any slimmer, definitely 6 or 7 foot though. I have 3 probable males so I know they will enjoy the space.
5' long x 4' high x 30" wide makes a nice size for a male oustalets.
Just get two reptarium covers and some pvc corners. cut one side out of each cover and sew them together with fishing line, then build your own pvc frame. You end up with dimensions above for around $100. Put the whole thing on a table so the top of the cage is 6' off the ground.
No DIY for me....I'm not real handy so a Reptarium or similar is the way to go for me
I don't think you'd have territorial issues. Here in Florida we fine em' clumped together a few to a tree. Here's one of the ones found a few weeks ago...No worries, I definitely won't house them together. I don't want to stress them out or worry about territorial issues.