I think its maybe not so bad under here as mqay I suggest its not had this hitop on from very early in its life.see

Ive circled the rivits Ive drilled out and there are no other holes in the metal and I doubt the convertors would have used a s/hand top?
the areas of rust in places have nothing to do with hitop fixings etc.
these two show the roof and as you can see its not at all got to this which is a relief (well for you it is) im not fussed as welding is welding and some is more fun and entertaining than others, headcloth has come out but it was/is grotty.


heres a couple of the nsr arch/wing. I have highlighted the spotswelds and the lip which unless someone is making pattern repros then this has to be a genuine wing, been fitted a few years though

they have used the same bathroom white silicone sealnt to fix the support bits to it,
at the rear I have highlighted in yellow the replacement wing and the remains of the rotten old one outlined in red.

doing it this way is a ccomplete waste of time and effort as the rusty seam is still there festering away, if folk will remove a panal then remove it all if there is still rust in the way.
so it would seem that its had a hitop added and this at least (more when I cut it open further)by the same folks
mm