re: Mounting Hardware

Elegant solution. 

I have always wanted to experiment with bilding a type of shell chair, and this project have inspired med to look into that again. It would be cool to make a shell chair that is not from plastic. 
I have always been fascinated by the french, who used papier mache to make a kind of shell chairs in victorian time, like these: https://www.1stdibs.com/buy/papier-mache-chair/
Another way to go is water formed leather like Jon Goulder have used to make this fantastic chair: https://www.jongoulder.com/catalogue-settlerschair
Straw is also interesting, like used in this work by Gareth Neal: https://www.garethneal.co.uk/craft/brodgar-collection

So many ways to go...