It would seem that you have two roofs there cobbled together. The Early Devon roof didn`t have a cap like that one. It had an alloy angle type outer frame coupled by a large gasket to an alloy sheet. The roof would hold water because of the gasket which went completely around the perimeter of the roof about two inches in. As the roof was almost flat the water being held tended to puddle and make the problem worse by sagging the roof a little so you had a larger puddle etc etc. Lots of people have tried various ways to stop this letting in water but it`s next to impossible because its a flexi thing because we drive along the roads with it. Secondly the rivets holding the plate on were little tinkers for letting it in too. Someone came up with idea of a fibreglass cap to seal the roof and that looks like what you have here, unfortunately someone has taken a backward step and put a sun roof in it so we go back to having a gasket underwater again that is impossible to seal. All the roof repairs and the extra roof cap do mount up the weight quite a bit. The best one I`ve seen rebuilt, had just the alloy angle frame with a couple of slightly raised bulkheads across and a lightweight roof cap on top of that, some have front to back ridges built in to the fibreglass which really helps with the strength and stops the puddling. Then you can insulate it and do lots of things, but sunroofs that don`t leak are just building up to it. Not trying to be too brutal here but the design sort of lets it down, maybe why they changed it in 75/76 to a fibreglass roof pop top.
Ozziedog,,,,,,,,,,,,,,,,,I`ve had both. :mrgreen: