It would be hard to tell, but I wouldn't have thought that any/many holes would be needed. Personally I'd fit the H/K in the "slidy" bit (even if it means removing the cup holder) providing it fits, and any holes possibly needed would be well hidden.
I'd be very tempted to do it, but unfortunately at the moment cash limits me, buying a flat in April so I can't go splashing out on the Civic for a while
