Mine is doing great! (sorry for the late reply)
Samwise has put on SO much weight and is so healthy. I have had to move him outside.
I moved him from here (there was barely enough room to turn around any more)
To here:
The set up is not finished (I work full time and get home around 8pm). I plan to have a Kane Pig heater on the floor covered with dirt substrate and Aspen substrate. On the roof inside there will be a hanging heat lamp (thanks Harald for the suggestion) and over the door a tarp will keep out the drafts. Over all of this, I plan to put some netting so that they will be safe from birds and UFOs. The yard is fenced in, so if he succeeds in getting out of his pen..he'll still be in the yard..just difficult to find.