I am planning to build a green house the week after Thanksgiving and am hitting a road block with design ideas and could use a bit of insight. For those of you who have greenhouses and or have built them, what do you like and what would you do differently? I am thinking about going with pole barn construction with a gambrel style roof line using polycarbonate panels for the roof and walls with wood siding along the base, maybe about 3 feet tall. Any thoughts on this? My goal is to get this done for less than our around $500 for something in the ball park of a 10x15.