Hi, I'm having my patio redone and need to let the builder know the size I want leaving for a section that is approx 2 meters long where I'd like to plan some runners (clematis) up a trellis onto the wall. How big would you say the section needs to be be? My slabs are 600 x 600. Leaving a cut out 1800 x 300 (half a slab) seems to be a bit too big to me but I wondered what your thoughts were. Thanks for the help/advice.