Full-Length Tonneau Cover

I’ve been thinking about getting  a full-length tonneau cover for my Mk2.5.  The one I’m interested in is the 'Robbins Headrest Pocket Tonneau Cover ’ as featured in the Moss catalogue - see http://www.moss-europe.com/Shop/ViewProducts.aspx?PlateIndexID=3308 (Moss part number MX51149R).

Has any member got one of these?  Does anyone know how much drilling is involved.  If you have one what is your experience of this?

 Hi
I had one of these for about 6 months. Looks good, cuts down the draught in the cockpit, but oh dear if it starts to rain…you get very very wet trying to undo all the fasteners to get at the hood. Fashion over form I think. As to drilling holes, surprisingly on a Mk1 the top of the dashboard already has small dots where the fastenings go don’t know about the Mk2.5.  Your choice obviously, but I wouldn’t again.