want to build a 6mt x 4mt orchid house. i live in england at i think about 52degs north. I want it to be a serious attempt but need loads of advice. i curently have about 150 cool to medium but no warm ones.i keep them in a heated greenhouse. the structure of the building is not the problem i have that sorted its the equipment and the layout and all that stuff.any advice would be gratefully recieved.