Start To Convert a New BH Again At Alor Setar

Yesterday start a new swiftlet house again. This BH is located at Alor Setar. This is an old shop lot that located about 15 minute from city plaza. This BH size is about 20 X 70 feet. I am using an open roof design. I open at the middle of this shop lot. A hold about 10 feet x 12 feet will be open an below it will attach with a small pool.