I've been working on it for about three years now, my sons and I did all the work ourselves. Money is pretty tight so I had scrounge a lot of the materials I would visit construction and demolition sites and go through the scraps also I was surprised to see what people throw away in the local scrap yards, re-bar, I-beams all kind of stuff is out there if you look, for example my vent pipes are old 4" fence posts that a guy gave me just to haul them away. I figure I got about $10K in it all together most of that cost is from concrete, blocks, and mortar. I know that is a lot of money but we got a 12’wide x 40’long x 8’ high shelter at a fraction of the cost if we had someone else build it or even if we bought the kit in the link I showed you.