yeah im basically gonna insulate the whole inside including the floor and ceiling, then put mylar sheets all around the inside leaving no gaps, then put wood on all 4 walls, the floor and the roof on (inside), going to leave the outside as it is, then use that white plastic stuff on a roll and line the whole of the wood with that so there is no gaps and it has reflection. then once this is all done, one side of the shed is wood, the rest is made from bricks so im going to drill a hole through the inside to the outside for an exhaust fan. Then put 2 600 watt HPS lights hanging from ceiling with adjustable chains, and a couple of fans in there too. the shed is like in the corner of my garden surrounded by big bushes so its kind of hidden. might try some SCROG too. all sound good to you mate? cheers for input .. GW