I did a similar thing with a Frod Thames van back in the time of trouser turn ups and Black and white tele's using a the top from a fiberglass railway signalling line-side equipment cabinet.
Unless you have omitted them for diagrammatic simplicity you don't show any means of controlling the for and aft or sideways lateral movement during erection
or let down.
Or even while permanently up for that matter
.
I controlled mine with a cantilever device at each end which worked on the principle of a scissor lift. This was made from lightweight rectangular tubing with slots and rollers in the sliding parts. Being young and strong at the time I didn't use gas struts but they would obviously be advantageous. My one had canvas walls which tucked down the gap between the lip on the top and the lip which I formed around the van roof aperture.
Or have I got it all wrong?
Cheers
CS
Well-timed silence hath more eloquence than speech.
"A quiet shy boy who took little part in games or sport"
88 High top 2.1 WBX
