I engaged Mr Yee (from Ryansia) forum to do my whole house plaster ceiling (22x75) and costs 6K. I believe is reasonable. He has almost finish and happy with his work. At first I am blur and dont know how and where to put the light and wiring. After he came and give me a lot of advice and all my query and problem solved. He use chinese worker and abt 2-3 days finished the work already. Cutting hole for down light are free. Interested can check in ryan's forum and got his contact number.