Thank you MsHerbie for the copies, appreciate the effort thus far. I am still not a lot closer to the riddle, bit also note that they make mention of some spacing methods, and that the roof tend to arch more with a new top cover ( I must add that the old cover were vinal, not the proper stuff) and that could have coused the roof to engage at in increased arc than the free frame at present, will check as i progress with roof.
To the vw Mathematician, VW Stan , I was also a purist (51 RHD Split, 53 LHD Sunroof Std Split) i got a live afterwards, and started liking myself with the car, not that car on a photo alone. Your opion being you own, honered and noted x nuthing!
tx
Chris