No, you don't use a metal leanto. You buy an old shipping container, like the ones that they use for ocean-going vessels. Alot of Wal-Marts or other large box stores use them now for storage behind the stores. They're about 40' long and 8' wide, and can fit about 20 pallets of wood in them. Then you use a air circulating fan and some venting fans on the top. Here's an article that might be of some interest as well.... http://www.fpl.fs.fed.us/documnts/fplrn/fplrn254.pdf You need to get the moisture out. If done right, maybe with some heat, you can turn your wood over in about 5 days, rather than letting it just sit for 6 months - 2 years.