The Praxis Zero is a modular framework for building custom guitars. A metal frame allows different parts to be added and removed to change the sound and feel of the instrument. An electronics cartridge makes swapping pickups easy.
The Praxis Zero has gone through many iterations since development began in 2009. You can download the most recent version here.
Marabunta is a parametric instrument designed to be tailored to the exact specification of the musician. The design of the instrument can be adjusted from an electric mandolin to a massive bass. The scale and number of strings can be changed to create virtually any type of lute.
The Kimura Gumo is a guitar that was used as a test vehicle for digital technology. The guitar has gone through numerous changes over the years, culminating in a MIDI controller with added sensors.