Thanks Rob and Graham. A long road, and as it was commented to me the other day "Why on Earth are you making a 12"? You could buy a 12" dob cheaper than you could make one". This is true as this dob will end up about 15-20% more expensive than a 12" GSO dob, but I couldn't explain to the person concerned why I was building my own unique scope. I think the reasons go without saying.