Roof removal

Hi

I have a VW T25 Autosleeper Trident that requires some tidying up. There is a little rust above the front windscreen under the rubber trim. A local VW specialist says that they would need to weld a section in place of the rusty section. This itself is not an issue, however they say they will need to remove the roof to do it properly. This involves quite a bit of work I would imagine.
Does anyone know how the roof is fixed on? Is it bonded? Does anyone have any experience of removing the roof on a older Trident? I am somewhat concerned about them messing up the inside of the van.

Thanks
Rubystar

There have been some very comprehensive threads on here with photos showing all the gory details. For example:

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Although it's a Trooper the principles are likely to be the same as a Trident. IIRC there's at least one other detailed thread on this subject, so some forum searching would be worthwhile.