Make Your Own Simple Theremin : 4 Steps (with Pictures) - Instructables
Amazon.com: MicroKits Theremin Electronics Kit | Educational Electronic Music STEAM/STEM Kits for Kids or Adults | No Tools Needed Easy to Build Breadboard Kit: Toys & Games
DIY Theremin Kit | Make: DIY Projects and Ideas for Makers
Art's Theremin Page: A Theremin Based on the Southwest Technical Products Model 142
Construction kit, Theremin for DIY soldering at Hobbyklok
Open Theremin Project An Open Source DIY Theremin – Synthtopia