Nester,
If I was to give one piece of advice about a garage that is going to be worked in this is what that would be. Wood burns from sparks, ( torches, welders, griders, fire pit to drink beer around when it's cold, etc.). Steel does not burn.
Speaking from experiance, build the steel if at all possible. If you are getting jerked around by steel guys, drop me a line. I might be able to help.
topcatfin@aol.com
Lonestar #024