I dropped by at Robs, the seller of the Wiesmann hartop, in Holland last week.
Can report the hardtop is in great condition, but I have decided not to buy.
Reason is that I can see that the fixing on (rhd) passenger side would indeed require the removal of the ram fixing previously mentioned.
I'm not really keen to be doing this, as I would want a hardtop that can be removed easily when I want, and the softtop bought back into play without any further work.
Its a great buy at 775 euros, under £700, and includes the fitting kit and heated rear window switch. Its in a good location too, just north of Eindhoven, an easy run from Dinkirk, less than a 3 hour drive. Needs to be for a manual roof car I guess!