Hi Pete,
The DA 85 is available now, check out -
http://shop.desertaircraft.com.au/catalogue/c9
I will be watching this Tempest build with envy. I have had a thing for the Mk V for about 25 years now. Built a Brian Taylor one in 1991.
I have some pretty good doco on the Pest if you guys need anything.
One of the locals is building a 100" span MkII that will be powered by a Saito 450 radial. It will be finished in the next few months. I am slated as test pilot, should be interesting.
Cheers
Mick