The first thought that comes to my mind is the Men's Shed Association. Typically it is a minimal yearly fee and you'll certainly get your monies worth even for a one-off project. Access to their tools and knowledge would be well worth the investment. You are quite lucky, having several locations to choose from, I would encourage you to call them all letting them know what you wish to do and gauge which location appears most happy to assist. Your closest locations are Leichhardt, Marrickville Redfern and Pyrmont Ultimo Glebe Men's Shed.