Vertical Squash

I tried BNS last year - they just slid down the supports!
Like SC, I've grown them over a sloping grid. supported on the sunny side with posts,  (?Munty frame) which frees up space for planting below.

Years ago, I saw squash being grown along the top of a hedge -planted at ground level, obviously, and encouraged to climb to the top of the hedge - then left to wander along the top. He also had them climbing over arches.

Firstly what's BNS?  Beans not Squash? Bright New Shoes? 
Secondly, I tried tromba vertically on a mish mash of bamboo canes, tromba was happy enough until the frame collapsed.
Thirdly, spookily, I was looking up planting distances for Scarlet's mystery beans and getting nowhere and sidetracked,  saw Munty frames mentioned.  Never heard of them  I was going to start a bean support thread. Might still do so.