i am fitting 6 low vaultage downlights in the kitchen but i can only get access from below the ceiling joists run across the narrow part of the kitchen about 1 foot apart, i want to fit the lights lengthways three at oneside and three at the other side the only way i can think of is to cut pieces of plaster board away and were the joists are chisel a slot to run the cables through, open to ideas. jc19066kc