Well I will start out with a start to finish on a metal building. I finally made it happen after years of planning and saving. I picked the 40 x 50 size (2000 sq ft)because I thought it would be about right as I had cars to store and cars to restore. LOL. The slab was really a basic slab except in the area where the lift was going to go I poured it extra thick. Get your stub ups in for your utilities now. I had some good friends of mine give me a good price on the concrete work. The building was a 40 x 50 with 12 foot high walls. I upgraded on a couple things and glad I did now that its over with. I went with the I beam "A" frame as the main support so I would have a hoist point. (Damn handy!!) I also went with 100% galvanized structure components. It was a bolt together opposed to a weld together. I also went with the 3" vinyl backed insulation. Im in Texas. LOL! 1 walk thru door and 1 10 high and 12 wide garage door. My friends and I built it ourselves. Saved me alot of money (except in beer.) doing it that way and it wasnt that hard since it was a bolt together. The bldg. came from penn. as where most of them do no matter who you buy it from.