To replace the fabric cover and the attached rear window, either plastic or glass, does not involve messing with the drive system, it’s micro switches, etc. Although, yes, it only involves three bolts on each side to remove the top frame from the car, the top frame is so hard to handle on a workbench that it is easier to leave it on the car. Most of the work replacing the fabric is easiest to do with the top in service position.
Like anything, speed comes with practice. My first top replacement took a week, but now it only takes all day. A commercial top shop well familiar with Boxsters certainly could do a top replacement in one working day, and $1100 parts plus labor is not a bad deal.
One of my Boxsters had a glass window top when I got it. The glass window, inflexible, must be fairly narrow so as to fit behind the optional rear speaker box; also as a result there is severe flexure required at the top edge of the window, leading to early failure of the stitching there. For that reason I have since opted for plastic window tops. Rearward visibility is much better with plastic windows than with glass because of their larger area.
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