First, a bit more on adhesives.
While I was in Screwfix I saw the pinkgrip. As I have said not very good. I tried a similar test with the Sikaflex 512, no comparison, stuck fast. The initial grab with the pink was better but it eventually fell off
I have already cut the hole for the fan powered vent above the table area.( framework designed ready to take

) Two reasons really, One to allow it to cool down better but mainly to be able to use the hatch to reach to fix the aluminium sealing strips where to 2 pieces of roof join. The vent is a little bit the worse for wear as it was second hand when it went into lightning. A replacement later, possibly. Looking at the picture and thinking about Zildjian's large skylight If I went down that route I think I would need to beef up the framing.
As I intend to just screw and not glue the inner skin initially it is always a possibility. I want to leave access to the framework for potential alterations, modifications after a few shakedown outings to see how it fits together.
When it was too hot outside I put a fan inside and started fitting the insulation under the seating area. The piece nearest the wall has insulation glued in while the remainder is a storage box and access to the turnbuckle.
The floor of the cabover bed has been screwed in place as has the angle for the cabin end and the checker plate. I was able to work in the shade under there at any time of the day but it was still very testing to try to hold it in the correct position to get the first screws in. A bit like trying to hold a bag of snakes above your head. With the help of 2 clothed line props, 2 lengths of box section clamped on it to help stability and a lot of expletives it went into position. Just under 40 screws should ensure the sheet stays in contact with the framework whilst gluing.
The left side and main roof sheets are ready to be glued in position as all the fixiing hole are in them ready to hold in place but I will proably wait and do them all at the same time
My caravan steps that saved the day when the wind tried to move the camper for me. It is still standing on them now and I believe I just need another foot in height and it will be the right height for the truck bed.
I just need to trim to size the nose end sheets, then refit the aluminium edging. I still think I might have to anneal it to get it to lay flat. Its got a lumpy curve where I flattened th angle out to about 120 degrees

"Success consists of going from failure to failure without loss of enthusiasm" .......(Winston Churchill)
2007 Ford Ranger "Thunder" 4x4
Camper aedificavit domum
2016 Ford Ranger "Wildtrack" 4x4