Hi Bob,
the chap that built this is Martin Gregory, unfortunately he doesn't have an email address, somewhere I have contact details as I am currently building a Quorn along the lines of his.
I have his drawings but I'm not sure if I can pass them on as I think he is now selling them.
I will try and contact him on your behalf to see if I can pass on contact info.
PM me if you have questions and I will try to answer as best I can.
regards
Graeme