Concrete and catalyst all mixed up.
 

well anyway, it was a good try.

Funny, I was just talking to my old boss yesterday about the Hiller E4 (the one with the larger cabin). He said stay away from that model!! The 12E, which he did have experience with, didn't have any major issues that he could recall. Don't know the differences between the C model and E model, though. Sounds like a neat project.

Don't those things break if you look at them wrong? :D

I would imagine parts and/or support would have dried up a loooong time ago as well.