He's a blessed and lucky boy to have you. Hope tonight goes very well for you guys! Can't wait to hear what you named him and how he fares in his adjustment to live on the "outside" of his prison.
Not a big fan of HUSA but here's some information on crate size from their website and another website that pretty much agree on the size a crate should be.
Crate Training : The Humane Society of the United States A Trainer's Truth About Crates | Modern Dog magazine
Think of the crate as a hideaway, a tiny, private den, small and cozy. Mainly, crates are used to temporarily house your dog when you can't be watching him until he's housebroken so they don't need to be living-quarter sized or big enough to romp in - just big enough for the dog to stand up and turn around in, sleep with his legs outstretched. If the crate is too big, the dog will eliminate in one end and retreat to the other, which doesn't hasten the dog to hold his pee or poop at all.