Thanks for all the replys!
Well As cost and construction isn't going to be too much of a issue (thanks protyping lab). Im running my 10" which is at f4.7 at most i will barlow this setup which will run it to f9.4 with a focal length of 2.6m. The pier will be enclosed by the ROR that im about to construct, (see my other post green light for ROR obs) the walls of the obs will be approximately 1.5m off the ground.
Rally, I am aware of the leaver, but when using a Canon 40d, i do not belive that a micron difference is going to affect such a scope maby 30 or 40 micron might have a slight effect but with the resolution captured by the 40d its not SBIG quality and the SBIG is a long way away!
As to dampen the internal external vibrations sand will be added and compacted within the pier.
CoolhandJo, The idea of just using a square tube is most appeling as it is easy to obtain a sizeable piece at a resonable cost. what are the dimensions of your post?