I have a stretcher built and have skinned 2 shamisen so far with great success. I am willing to do this for other people I can only use goat or calfskin (because cat and dog are illegal to import). If anyone is interested please send a message.
http://i303.photobucket.com/albums/nn132/great_blad/029.jpg
I charge $125 a side + shipping. You can contact me here to discuss arrangements.