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If you get down to rock drill some holes and chemset some starter bars in it to tie it in to your concrete and that pier will be going nowhere. The observatory at kandos I built is similar dimensions to the one you are proposing and we used a 100mm slab and a 100x 300 thickening beam in the slab edges and that was class 'm' moderate reactive soil there from memory. Is the area granite or reactive?
The kandos observatory we used a welded steel frame with .42 monoclad (stramit's trimdek) and used a similar product to aircell, but it had a bubblewrap, and I really have no idea which is the best to use with that or the foam aircell.
The extinex panels are polystyrene? If they are they work great, as Guy mentioned he has used polystyrene and it looks great and insulates well without having a huge thermal mass that will leak heat well into the night.
Walls 2.5 high is pretty high, unless your pier is quite high as well, Which come to think about it if you swinging a long refactor....
I have a hollow pier and I drilled holes for running cables up the pier, but I didnt use them, I read some where to carpet the pier which I did, and its way more practical than I would have imagined because a)velcro stick to it (think power supplies, usb hubs, focus contollers, dew controller etc) and being able to attach it where you want b) I ran the cable between the carpet and the pier, it looks tidy and you can run the cables wherever ie no 240 and data together. c) its easy to make changes.
Freds idea of running the pvc works great.
The adjustment of bolts at the top of the pier works well, use fine threaded bolts and a huge plate, since you are using a paramount, you can use the pier adjustment plate made by bisque and the hard work is done for you.
Brett
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