Good day, my name is Martin Bland, I have been following the audio list for some time. I first logged on looking for info on Binaural beats and brain entrainment but no one was able to assist.
Anyway, I am an artist. If you arent able to find a way to make your pinna mold, I would be happy to assist or answer questions as I have experience in making molds.
If you are just looking for info, try cementex in NY, they do a latex for mask making etc. I have used their products, pretty good. I am not sure if they have a web site but their catalogue gives a basic run through of how it is done. With photos to boot.
Feel free to contact me directly if you are looking for a low tech alternative to Laser Modeling.