So I take my two torts out of their heated home every morning and place them in their beautiful 6' by 6' enclosure on the grass with low water dish, hide, and some rocks for beak shaping. I now want to attach their enclosure to possibly a large dog house with insulation for them to retire into on their own at night. I wondered which dog house and how some people modufy them to add a CHE to the inside for warmth? I want to get started soon while it is summer time for them to adapt during warm months. Stella and Ruby say thanks in advance.