Hi Phillip,
Thank you for such a considered reply. All of your suggestions are useful. I had initially started with home coated glass plates (of which I'm still working on) and processed in a tray with no cuts to fingers yet!
I'll expose these before years end and hopefully end up with a good result (perfect would be great but but I'll settle for good for now!)

Enrico Scotece
www.thinknegative.com.au