@4b16f0b6 Cheap materials but, he spent a lot of time and a fortune on specialized equipment. It would be more practical to build it with conventional materials, even if the materials cost a little more, you're still not going to spend as much as you would on equipment. 

 @4b16f0b6 Who wants to convert their lawn mower into a styrofoam mulcher? 🙄 

 @9595301e 

Yeah I didn't think that looked easier than Aircrete