here's something you might want to check out. It has a different design , but it's pretty amazing. The entire shed moves on rails...here is the link. When you get to the page it is in the ADOBE ACROBAT READER form. the beginning of the story on the observing shed starts on page #4.
http://www.atsi.ca/raschc/rascfiles/...rb_june_05.pdf
ENJOY !!!
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Mark
12" gso scope