Very well made Lee...
I don`t think it will ever blow away!
Very similar to what I have done with mine so far except I used 4x2 treated pine for the floor at 300 centres to keep the floor lower as I didn`t design the pier for a observatory! I`m going with the ROR setup and I am up to doing the supports for the roof when its pushed off!! but the rain has put a stop to that at the moment!!!
Look forwards to your progress and posts!!
cheers..
