Check out this video, it shows a tent made of canvas/concrete. The resulting building would make a perfect growroom anywhere, with good security. No info on price. They are being used by the military right now.
http://www.wimp.com/concretetents/
It would be easy and relatively inexpensive to build something similar using a boat building technology called ferrocrete. You make the basic shape using re-bar and chicken wire, then add concrete with one person, or more, inside smoothing the concrete and one person, or more, on the outside doing the same.
I remember in the 1960s when some Hippies built homes by mounding dirt, the using the re-bar and chicken wire. Then the concrete was sprayed on the outside like a swimming pool being built. When the concrete had hardened, they dug out all the dirt and had a very strong concrete home.
No worries about the wind or the ripoffs trying to steal your product.
Just Google ferrocrete to get details and photos.
http://www.wimp.com/concretetents/
It would be easy and relatively inexpensive to build something similar using a boat building technology called ferrocrete. You make the basic shape using re-bar and chicken wire, then add concrete with one person, or more, inside smoothing the concrete and one person, or more, on the outside doing the same.
I remember in the 1960s when some Hippies built homes by mounding dirt, the using the re-bar and chicken wire. Then the concrete was sprayed on the outside like a swimming pool being built. When the concrete had hardened, they dug out all the dirt and had a very strong concrete home.
No worries about the wind or the ripoffs trying to steal your product.
Just Google ferrocrete to get details and photos.