I made a PVC greenhouse-frame to sit over the tortoise enclosure complex I made for my five torts... I made do with the lumber I had and have a fun variety of spaces for them now.
4x4 for the homes hingeback
4x5 for the black mountain tortoise
4x6 for the Redfoot
5x6 for the Russians
I'll put the plastic sheeting on the frame tomorrow... my thinking is that the plastic topping can stretch the temperature at which I can put the torts outside.
Jamie