Thanks Crossy, Yes, the pond is the main concern. If we are to have one, I would need a reliable power source. However, backup power would also nice. I aim to build a simple 4mx5m barn/shop with a partial second floor (side walls only one meter high and a vaulted ceiling for storage and possible guest room. I'm considering a solar array on the southside roof and a carport roof on the north side of the structure. By the way, did you have to do pinning for your pond? I live in Pathum Thani, and pinning for the house went down 20 meters. It would be a small pond, only 2m by 2m and 1. 5 meters dee, or about 5,500 - 6,000 liters of water. However, I'm afraid of it sinking. With each cleaning of the pool we would use the drainage for fertilizing our gardens. Have you done the same?