I love your enthusiasm, and that large cage will be great. Few things to consider though, 120 cubic feet of dirt is A LOT of dirt. Moving in about 8 cubic feet for my ackie was enough work for me! (Maybe I'm just lazy) Might I suggest instead of doing a 3 foot deep substrate in the entire cage, have it lower on one side and higher on the other, creating a slop. It would give plenty of room to burrow and add extra temp graduates. For heating, your gonna want to limit your air flow in the cage to just a few vents. That way you keep the heat in. If placed in just the right place, a single lamp can do great. My 5 foot by 3 foot by 2 foot tall cage is entirely heating by a single 100 watt bulb. A toasty 120-130 basking to a cool 80 degrees on the cool side. And regarding the second sav, be careful and watch them carefully when you introduce them. If they don't get along, your either gonna need a separate cage or find it a new home. Two 10 foot cages is a lot of space! Hope this helps!
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Jason

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