Glad to hear the local reps stepped up to take care of your situation. I had several floor coating jobs fail when I installed a Polyurea product which is no longer manufactured. Even though I lost considerable money warrantying those jobs, in the long run it provided new and repeat business for...
I have Gladiator cabinets from one of the first batches Whirlpool ever made. Even have a discontinued Modular Refrigerator that fits beneath the workbench. Mine have rolled around to countless trade shows years ago and now reside permanently in my garage. They still work like new and look...
If you decide to build your own shed, here's a link to a page that has 8 free plans available. They are some really nice sheds too.... even though the plans are free. Most are from old issues of Family Handyman. http://www.todaysplans.net/use-familyhandyman-shed-building-plans.html
You definitely should check the floor for moisture content before coating. You can tape a 2' section of plastic down in several locations of the garage and wait 24-48 hours then lift to see if moisture has collected on the bottom side of the plastic.
Preparation will be the key to having any...
I have seen many garages with truss roofs where the homeowners have used the space for storage. However, it is not recommended though. The easiest way to insulate the space will be to use blow-in insulation. The R-value of loose fill cellulose is R-3.2 to 3.8 per inch. Loose fill fiberglass...