agpage wrote:....I find the Mirage a big improvement over the typical A-frame pop-ups.
I have designed an A-frame pop-up and it's mighty complex to get all the geometry right - complex enough that I decided not to publicly post a design since, to a large extent, if you can't design it yourself, building it would be nearly impossible.
The Mirage five-piece pop-up adds another panel that has to be exactly the right size in two different situations, so the design problem gets bigger, plus you have to devise a way of lifting the roof panel up. It's also a big flat panel to make watertight.
I bet the manufacturers of these pop-ups scrapped more than one prototype before they got their design right and for a home-builder that would be an expensive, time-consuming, soul-destroying process.