A tricky lockup

This was a tricky bit of composition — I was so pleased when it held together and lifted without bits dropping out that I had to take a photo.

I could have done with some of those SB curved plastic quoins for this, but only had triangular angle quads. When using these it is important to tighten the mechanical quoins gradually, alternately. If you do one direction too hard it all goes skew-whiff and collapses.

Done