You may be able to find some wall paneling at a salvage yard to use instead of sheet rock to cover the insulation, too. Sometimes you can find give aways really inexpensive in the local nickel ad type of free papers, too. I have seen cabinents, light fixtures, wood, carpeting, just about anything that you would need to remodel your garage into a quilt room/studio.
For this type of construction, you will probably have to get building permits and you may not have a lot of say about taking short cuts.....unless you live in an area where no one will be around to notice what you are doing/have done :wink: The downside to not getting permits/inspections is, if you should ever need to file a homeowners insurance claim, they can check to see if you have done any major renovations without permits just so they can turn down your claim :?