Hello Bob, Others have brought up good points, which I myself wouldv'e
brought up to you also.
You make no mention of scope, mount, and if you've already purchased the
I'm an Amateur Astronomer myself in Southern NM, and a few years back,
when living in Chicago, I bought a 2 month old Celestron C-14 OTA from a
fella living about 100 miles south of Terre Haute, IN.
He sold the C-14 to upgrade to a more expensive 12" RCOS Cass.
He was using an AP1200GTO Mount, which I myself also used to own (just
sold mine) and it was on the second floor of his house. The pier went
through the observatory floor, through the first floor, through the
basement floor, and down to bedrock. No matter what he did, (Bracing,
etc on the lower floors) he still would get shake/vibrations, and had to
be extremely careful when imaging with his SBIG CCD Cam.
With his arrangement, he had constructed a rool off roof on his house,
instead of using a dome, as you wish to do. A roll off Section could
possibly be built lighter than the 350 lb Fiberglass Dome you propose,
and no doubt much much cheaper also.
As another mentioned, thermals will most likely torture you also. I can
recall this fella I mention needing to resort to AC in his observatory
to bring temps down.
I'm sorry to hear that you don't have too many options with the
surrounding trees in your area.
Hope you can solve your problems. Mark D.