Truthfully Nige I haven't made an attempt to load yet. Procrastination. Will your wiring be openly exposed on the surface of the block? (I think thats the only option rather than destroy the blocks integrity trying to insert pvc to hide it.)
Will you do an overhang of the front porch or leave it open for sun bathing? Half of my house upper floor is deck, but its all covered by roof tiles. My second floor deck is 4 meters wide on the North and 3 meters on the front East side. Summer sun is brutal!