I have been looking at the star plates that strombergs sells for building sheds, greenhouses, chicken coops and the like. Has anyone used them? Are they worth it? Looks like one person can build a shed with these is that right? I would like to build a greenhouse and a goat shed. The sets are $55 and take 25 two by fours and I imagine 50 bolts and then whatever covering - sounds like a quick way to build a structure but I am not sure.