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Rob - I took about 100 photos from all sorts of angles (including internal) of that scope before I left. I'm going to be adding the dimensions I need measured to those photos and will be sending them on to Paul and Mark so that they can elaborate. I'm starting to place orders for helical spiders, truss mounts, secondary holders, etc, etc already for my set. I have also already placed an order on Mark for two of his 12" f/5 mirrors, as per Paul's set.
I've also recently bought "The Dobsonian Telescope - A practical manual for building large aperture telescopes" by Dave Kriege and Richard Berry to get my head around the construction techniques. Only problem is that it starts off talking about 14" as the smallest they cover, but a good text nonetheless.
If you plan to go ahead, maybe we can both grab some ideas from Mark and Paul - and I've already had a good think about using two spare RA steppers to electronically move the mirrors to achieve coaxial alignment.
Cheers
Chris
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