homemade...
The inside height is 6'4", I'm 6'2" and can touch my head if I stretch... What I really like is the full height door! I couldn't stand going in and out through one of those "mini" doors.
The side wings are hinged on piano hinges that run the entire length of the panel. Also the side panels are solid 1" plywood with a skin of aluminum outside and wood grain inside.
The side latches are something very different... they are like cams with tongues... you put a hex key wench into the cam from the outside and twist until it grabs the panel. It both pulls the panel flush to the outside of the camper body and pulls the panel tight to the corner at the same time. This latch is key to the whole camper not shaking itself apart while offroading. The panels hang from chains on each end which are tied to the camper end frame panels with eye bolts.
There are two other secrets to the way this camper works... first is the door opening, which has a "U" shaped piece of 3/8" plate steel around the bottom of the door on the outside. The door end is also reinforced with framed book shelf/cabinets on the inside to keep the end walls from flexing.This is what supports the door opening and keeps the camper sides from just flopping outward when the top is up.
Second is way the top actually overlaps the sides and ends when lowered.. this also keeps the camper tight when offroading. The tricky part is making sure the canvas is all pulled in away from the roof joint so it doesn't get pinched.
Much easier to do from the outside... I use a heavy wooden yard stick to carefully push any canvas in while I walk around and latch the corners.
I also made a couple window panels to cover the side windows when the sides are down... I found it hard to believe they intended for you to lay directly on the window glass?!? I'm a big guy and wouldn't trust it...
Everyone who enters my camper can't believe the floor space and roomy feel it has. With the galley running across the front it leaves the entire floor open 4' by 6'. As you said, the beds are nice and easy to get to... no climbing.
They are like huge couches on either side of the camper. With the table mounted to the front edge of the galley counter, I can seat 4 people comfortably for dinner.
I look forward to seeing your progress on your home built version.
FYI, I see them in the MSP craigs list nearly every month, less than $1000 in most cases.
Prybry