Step 1: Materials and Tools
1 Rubbermaid 7 foot x 7 foot shed such as: http://www.rubbermaid.com/Category/Pages/ProductDetail.aspx?Prod_ID=RP091372
Square stock steel, 100 feet 1.5 inch square, 3/16 inch thick.
2 feet of 1.5 inch wide 3/16 inch thick flat bar.
30 feet of straight Garage Door track.
8 garage door rollers.
miscellaneous bolts and nuts.
Metal cutting band saw (not necessary but very useful!)
Drill and bits sized to your bolts.