For the mechanically inclined, I'd love an opinion on the following problem.
In the following picture, the open area in the cab over section, I designed the camper to have a third wall that nests between the upper and bottom boxes. It effectively makes it a hard sided cab-over camper, without needing to 'deploy' the hard sides. Each wall overlaps, and the middle wall is recessed back into the body of the camper, so it should be possible to seal this section well.
Design goals were to have it be adjustable, so in non inclement, non buggy weather, I could lower the third wall down and deploy a screen to make the camper wide open.
The tolerances are tight for actuated lift mechanisms, so I need something passive, either a hook and latch system that catches it up on the way up, or gas springs etc. I'd originally planned on gas springs, but with their range of motion, they really encroach into the bed platform area, it just doesnt feel like the most elegant solution.
I'd also thought about a ceiling mounted pulley system, where all four cords came to a common winch point, such that during normal operation, the middle wall would start to rise when the top started to extend past the bottom wall. But when I wanted to lower the wall manually, I'd use the pulley. Either way, still thinking this through and would love some opinions.
Big problem is that the stroke is 18" and the wall is 19", so it limits the type of mechanism I could fit in there. Also considered a standard pop top scissor lift type mechanism. Ive also set anchors for four stainless drawer slides (one pictured here) to help guide and limit the upper and downward motion (they lock out when the wall is all the way down).