The Open.Theremin project recently posted about a new Arduino microcontroller-based theremin design. Along with some new ideas for a shield module, they're also exploring some great looking cabinet concepts using laser carved wood and loosely inspired by the Etherwave Pro. Don't be thrown off by the left-handed sketches... we're pretty sure you can build it lefty or righty.
The project is currently taking comments on the new design, so be sure to head over to the Open.Theremin website for all the details.