I have a German Lietz microscope ground glass projection screen in holder for sale. It has ground opal glass in it, but is about 8 inches in diameter.
I live 12km north of Nimbin in NNSW.
It will be cheap -- make me an offer. Would swap for some telescope Eyepieces.
This is not it, but similar to give you an idea of what I mean. Microscope is not included.
http://www.radicalmicroscope.com/stu...e-1224566.html