Nice photos Jon. I am pleased to see another D&G owner in Australia. Is that the telescope that used to belong to Ziggy's daughter?
Steve your Polarex/Unitron is a great project.
I have an old Parks mount that I bought with the intention of restoring for use with my 6" f15 D&G but it is just so much easier to use it alt/az for the kind of casual observing I do.
Tim Wetherell used to have a TEC 200 mm apo but I understand it has been sold to America.
http://www.wetherellart.co.uk/pages/astronomy.html