I like it!
I'm not sure from your sketches, but are you now considering putting the pop-up side walls inside of the main side walls? I hope not, as I think sealing it would be much easier and more effective if the pop-up walls are on the outside.
In addition, this design has the pop-up roof "overhanging" so the hinge assembly is completely protected from the elements when in travel mode.
Good idea.
Two particular challenges:
1) Weather sealing the sides of the folding rear panel. Shouldn't be too hard with a small "curb" to act as a stop, with a weather "wipe" seal angle towards the panel so that it pushes tight and flares out as the panel pushes against it.
I'm sure you've considered this, but you could also put a compression seal (plain old weather stripping) between the curb and the folding panel
I might put wipe seals on the ends of the folding panel, too, just in case you are deploying it in a driving rain or something. But that's probably overkill. The down side is that eventually the wipe seals are going to mar the insides of the side walls.
Either the double wipe seal or the compression + wipe seal approach would give you a double seal, which I think would be important.
2) I'd like a roof access door, which either means placing it solely in the upper fold, or creating a hinged door assembly, which might be a bit tricky. The overhang makes it less critical when it's in travel position.
I did consider the pass-through before I suggested the folding panel, but I envisioned a sliding window (like used in the back of a pickup truck) in the bottom half of the wall. I like your rear wall idea, but the shorter lower panel pretty much rules out the sliding window, doesn't it?
And a pass-through in the upper section would be difficult to use. You could put a lot of strain on the folding panel when passing through the upper section.
Yeah, a folding door would be tricky, plus add openings to seal.
OK, so here's another thought for you to ponder: If the lower edge of the lower panel is mitred (or dog-legged) to mate with the roof, you could use a flat seal along the length that would be under compression when the panel is deployed. Then would you need a sealed hinge along the bottom?
The reason I ask is if the hinge doesn't have to double as the seal, you could use a couple of simple pin hinges along the bottom. Then instead of having an access door, you pull the pins and fold the entire panel upward. A sliding deadbolt on each end would hold it in place.
Matter of fact, figure out a way to put a roll-up bug screen across there and you would have one heck of a roof vent, too. :victory:
It seems to me that if you put a compression seal (or two) between the top of the upper panel and the overhang, you wouldn't need a sealed hinge there, either. So the only sealed hinge required would be the one across the middle of the panel. Right? Sealed hinges are much more expensive and harder to maintain than weatherstripping.
The increased roof height for the camper front due to the pop-up isn't a problem for me because the A/C unit and sat. dish are both taller, and the edge rails will almost be that high anyway.
Of course, just for athestetic reasons, you could angle the trailing edge of the overhang to mirror the leading edge of the pop-up section.
Consider this one volley'd back..... Let me know what you think.
Boink.