New digs

I really like having my BPs in glass terrariums but I would like to upgrade to something that is more space friendly. I have two BPs currently and would like to get a third so I was wondering if anyone has any suggestions for stackable and viewable terrariums? I currently have my 42in BP in a 50 gallon tank and would like to upgrade to something little bigger for him. I would like something that doesn't cost a small fortune. I am also very handy so if anyone has any building plans that I could use I would take them as well :) Thanks so much!

Pvc cages are stackable, look good, easy to maintain heat and humidity and they are light. Very easy to view animals in.
Pvc cages will run you anywhere from 100$+ depending on size, heat, light etc

Thanks so much for the info!