To get the price of each cosmic ray detector in the array down, I am currently developing a solid state detector using a matrix of low cost BPW34F SiPin Photodiodes, without the use of a scintillation panel. I have already used these diodes in other experiments and although on there own there are many limitations in it maybe possible to overcome them in a larger matrix.
The aim of this design will be to use layers of individually amplified photodiodes in a matrix where each matrix element is strongly pulse shaped. Coincidence detection is then measured between layers to identify relative location of where a Muon has passed through to produce each a colour and musical note output. This is a similar, but not identical method to the on used in my Cosmic Ray Hodoscope detector using GM tubes, but on a much smaller scale: