This labor of love was designed and constructed entirely by me with my Wife spotting/assisting on occasion. Sure, I'm needing more help as I get older... Also the trusses and metal shop work were ordered, prefabricated and delivered on site. This was designed as a 20'x24' Roll-off-Roof observatory for visual use and Astronomy Outreach (including 60amp/240V service, 6'x20' warm room, 2ea 6'wide inward swinging windows on the southward facing wall, 3'x3'raised independent support platform and a 20'x16'step down integrated decking). This effort was based on years of personal thought and hundreds of Cloudy Night posters with their many and varied forum comments and ideas integrated into the final design/build. (Really though, when is an observatory EVER completed?)
For a foundation, I decided on a wood platform structure verses concrete to preclude localized seeing issues. My 20" box fan is a GREAT equalizer for any remaining stray thermal differences! The independent support platform was built separate from the 20'x24' structure. Vibration is minimal, not ZERO though.
The roof is currently not motorized and is simple enough to pull open and close by ropes using my body weight. (OK, point of order, I'm only 56 and 230lbs @ 6'4" but I did use extra care with an Egyptian water trick!)
This attached picture is a current view. Main house to the left, Observatory to the right. An easy walk out the basement doors. Although not in any Homeowners Association, I did follow typical architecture control committee guidelines and common sense to match structures.
Getting late, more to follow.