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Im currently constructing one for a g11+10"RC, and used 5mm thick walled 150 tube + 2 x 300mm Square plate. the losmandy adaptor ring was milled out of 25mm thick 140mm ID tube (argh that wasn't easy).
All up its 920mm tall and about 45kgs worth of steel.... if you pushed that to a 200mm 5-7mm walled square section, you wouldn't have to worry about the thing moving.
Go down to your local fab shop, give them the specs and youll pay HEAPS LESS. not to mention you can oversee the job so to speak and it will be exactly what you want/need. Then you can get it Powder coated what ever colour you want!
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