I saw this and it reminded me of a HexaYurt - I made a 'Tent' from Insulation - Kent Survival

If you don't know what a "HexaYurt" is, click on the following link: http://hexayurt.com/

I've actually considered using the HexaYurt design, and mixing it with FerroCrete to build a small cabin. Build a HexaYurt out of the foam insulation, then wrap it in chicken wire mesh, then add the cement mixture to reinforce it. You could build a small cabin rather inexpensively. Although you would want to wrap it with either Tyvek or Tar Paper before covering it with the ferrocrete. Especially on the roof.

I have done a small shed with ferrocrete walls and roof. I'm talking a 6'X8' rectangular shed with a standard shed roof. We used pallets, tar paper, chicken wire, cement and sand we got from the river. The walls were simple tar paper stapled to the uprights made from pallets, then we stapled the chicken wire, then we glopped the cement mix on. We had to take it in stages. And let the cement mix firm up before we could add more.
Basically, we glopped about a 1 foot tall wall all around the base of the shed, then came back the next weekend and glopped then next 1 foot tall section above it, and continued until we go to the top. The roof was still open, as we weren't quite sure the walls would handle the full weight. After 2 weeks though the walls, which were about 1.5"-2" thick were strong enough you could thump them with a hammer and it didn't do any damage. So then we tar papered the roof, which was just the angled I guess you would call them trusses or joists, made out of wood from pallets, nailed together, about 2.5" thick, going from the 8' tall wall to the 7' tall wall, with a laminated board every 10". We just rolled out the tar paper and stapled it down. We put 3 layers of overlapping tar paper up, then we rolled out the chicken wire. We added boards to the downside to be sure the ferrocrete mix wouldn't pour off the roof. Then we glopped the roof like we did the walls, a 1 foot strip at a time. We had nails sticking up an inch in each truss/joist and we made sure that they were completely covered with the cement mix, to be sure the roof was thick enough.

All told, it took us 2 months of working on it every weekend to get it done. And it was pretty sturdy, though we did also ferrocrete the inside walls as well because we were concerned about the snowload in wintertime. I think we had maybe $300 total cash invested, but if we had done it all at once it would have been done in 2 maybe 3 weeks.

As far as I know, that shed is probably still standing. If you ever are near the Lake of the Ozarks outside of Gravois Mills and find a 6'X8' ferrocrete shed, well, now you know one of the people who built it. My friend sold the property back in the 90's after the county gave him garbage about his permits for a well.