Build It Green!NYC, the building salvage center located in Gowanus, just released its summer class schedule. BIG recently revamped its class offerings and launched BIG!Workshops, low cost do-it-yourself classes focused on learning how to create with reusable materials. The offerings this summer include a bench-making class using wood scaffolding, a bookbinding class, a how-to on rainwater harvesting, and upholstery 101. Prices range from free to $275. To see all the details and the class dates, go here.