Though I only have a lowly `58, its all pretty much the same. I spoke to Klaus Hermann Meyer about this a while ago and asked him if there was a way to make the roof removeable (to facilitate future welding, paint and so on).
He said they can split the rear tack strip and use screws to hold it in place instead of nails. Its all hidden anyway when the roof is installed, so you´ll see no difference using screws. You should probably call him though.
JD wrote: