I hope you don't mind my posting! Sullie babies can be tough to keep alive if you don't know what you're doing, and Kathy is right that the latest theory behind pyramiding (and, along those lines, premature death--way too many sulcata hatchlings die of renal failure due to chronic dehydration, which is part of the difficulty in keeping them alive) is humidity and moisture.
You should look at having a humid enclosure, including humid substrate, and soak them as often as every day. Mist them until their shells are soaked, as well, several times a day!
About your housing idea, Sulcatas are so big and destructive, they're really best kept as outdoor only pets, with a nice, big heated shed for climates with cold winters. There are some great ideas and examples of this on the forum I'm going to link to below. The forum is chock full of Sulcata keepers in all different climates. I'm sure you can get some great advice on a solution that would work for your situation. The issue, though, with the bedroom idea, is it can be hard to keep a Sulcata content in such a small space (consider this--they are geared to roam all day, every day, fantastic distances. A standard bedroom is a postage stamp compared to their natural ranges... Even the acre of land you might supply an adult is still small in the grand scheme of things!). Many Sulcata keepers have found that they have to at least give their adults the option to go out in their yard during the winter, or else the Sulcata will spend the whole day ramming the door to the yard trying to get out of their shed (in your case, ramming the sheetrock or the bedroom door!). Plus, it would be no fun having to carry a 50-100 lb Sulcata in and out of the house every day during the summer!
Also remember that twice as many tortoises means twice as much space and twice as much work, especially if they end up being male/male or male/female and need separate pens. Just getting one might be the better idea, especially if this is your first tortoise(s).
If you stop on over at TortoiseForum.org, you can get some great advice on Sulcata care. I especially recommend taking a look at these two threads:
http://www.tortoiseforum.org/Thread-The-End-Of-Pyramiding and
http://www.tortoiseforum.org/Thread-How-To-Raise-Sulcata-Hatchlings-and-Babies You can also get some very well-started, healthy Sulcata hatchlings from a few breeders on the forum (i.e. Tyler Stewart, owner of TortoiseSupply.com), as well, if the deal with Kathy falls through for one reason or the other.
Just some information you might find useful. Good luck with your Sulcata(s) when you get them. They're great torts!