Eric
Im currently working on my shop. My plan is to use two 20' container boxes or "Conex" boxes seperated 20' apart. Then truss over them with 40' trusses and a sheet metal roof. So I will have 2 "shops" one for grinding and dirty work,one with a heated and cooled 8' "office" for detail work, and a 20'x20' area for the hot shop and what ever else I decide to clutter it with. I started with a pad (crushed shale) then had one box moved in (got it on lease purchase for $50 a month) was luck about 2 years later to find another box in fairly good shape for $900 and just so happened to have a decent tax return that year! I still only have 2 boxes, but Im gaining. I am proud to say that I "officially" unhooked the extension cord I have been running off of and the "shop" is now under its own power!!! Hopefully in the next year or so I will be able to finish the roof. Guess what Im getting at is sometimes these things take a lot longer than what we want them to! Just hope Im still able to work in my shop by the time I get it finished! Shop your area, these boxes worked out well for me, and you would be suprised how big a 8x8x20 area actually is.
God Bless
Mike