Still waiting for the rear spacers to arrive but managed to get the rear clam on for a trial fitting earlier today. I removed the 4" either side of the rear crash bar and the good news is my measurements were spot on with trailing edge clearing the top of the pipes from the new exhaust but it is catching slightly on the rubber hanger holding the cat - that may be as the clam is too far forward on the car (see below).
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Front edge where it meets top rail of windscreen looks less good with a big gap. I know there is a void to the hardtop that will need filling but I suspect I need to shift the whole roof/clam back a couple of cm to line it up and get the pillars anywhere near close (mine are separate due to getting the kit couriered).
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Will fit the sills first so next job is to remove the two doors and do the mods to the trailing edge of those. Alongside that will make a start on cutting out the various holes and light fittings on the rear clam.