I'm still in "build mode" with my smithy. I'm mounting my bench grinder, post vise, and buffer on 6"x6" timbers sunk into the floor. I had to fill the floor area with red clay sand due to the shop being added on to an existing structure as a lean-to. Later I will add a few inches of pea gravel after I set all the post and wall it up. End result will be a 15'x20 lean-to with forge, anvil, buffer, bench grinder, belt grinder, post vise, drill press, table saw, band saw, woodworking bench and sink with hot and cold water. Best of luck building!!