TortoiseForum.org - Here’s an excellent thread detailing the structure and set-up for a DIY outdoor tortoise shelter.
Heated Outdoor Enclosure
Oct 31, 2012
by Editor in Chief
Tortoise Trust - A member shows how he built and insulated an outdoor shelter for his tortoise, and includes links to a tube heater and thermostat that he’s used and is very happy with.@ Tortoise Trust