Use this as a rack guide:
http://www.arbreptiles.com/cages/rat_rack.html

If you have a shop, put the rack in it. You know damn well the goats will F' your rat cages up. They will headbutt it, stand on it or just knock it over just to see them.

If you have a pump house that you heat the rack will work there also.

What's your ballpark location. Some of "us" might be close for ideas or help.
Good luck!