I needed more plastic to practice gluing, so I stopped by Tap Plastics scrap bin. Though I haven't started gluing anything dimensional together yet, it seems like it will be difficult. The salespeople at Tap suggested using a jig; they actually build their own, and sold me this one. It seems there is a real art to gluing acrylic together. I also bought some silicone sealant, for possible future use. I left with a plastic contact high.