Roll-off-roof observatory.

Update 3/10/22
My RA error was always much more than my Dec error. I removed the plate covering the RA belt and found that it was loose. I tightened it up and my guiding is more consistent. I don't know if it was loose from the factory or if it stretched, so I will check it out every few months and see if it continues to stretch.

Update 1/14/22
Everything is functional now and I've been imaging. After using N.I.N.A. 3 star polar alignment my  guiding is very good. Check out image 'o'. I wish my guiding was always like the one shown in 'o', but conditions change and so does my guiding. My RA error was always higher than my DEC error, I found that I had end-play in my worm gear. I've fixed that problem and I am now redoing my PEC curve (when the clouds go away). 

Update 12/31/21
With the exterior 5/8" plywood paneling in place, the walls are over 1 inch thick. I may not need much, if any insulation.
Most of the exterior is done. The corners need some 1x4's to cover the unfinished edges. The back wall needs some work, but I'm almost ready to start on the interior.

Update 10-13-21
It's coming along. I now have electricity to a breaker box inside the building and the roof is on. I can move the roof with one hand but it is a bit heavy - maybe an electric motor is in the future. I'm about ready to get to work on the exterior walls. I wish supplies weren't so expensive, I almost passed out the last time I went to Lowes.

The adapter for my mount is made from a 1983 VW Socorro brake rotor and a steel plate. The height can be adjusted somewhat, but I'm hoping that won't be needed. The hole in the center of the rotor is a perfect fit for my SkyWatcher EQ6-R Pro mount.

The concrete pier goes 3 feet into the ground with 1750 lbs of concrete and lots of rebar. The pier has a diameter of just over 12 inches and is isolated from the building.

The building is framed with 2x6 lumber.
The floor is framed with pressure treated 2x6 lumber.
There are 8 pressure treated 4x4's set 2 feet into the ground with concrete.
The roof is framed with 2x4's 16 inches on center with 9/16 OSB covering the 2x4's. The OSB is covered with tar paper and on Monday I will order the metal for the roof.

The floor of the building is several inches from the ground. When we get heavy rain water will drain under the building.

I've installed a lot of hurricane ties and structural screws, we occasionally get some strong wind and I'm hoping the building can withstand high winds.  

The roof has 8 rollers, 4 on each side. Four of the rollers are on a track.  I can move the roof fairly easily with one hand, but one day I might put in an electric motor to power the roll-off.

I looked at a lot of observatories online and finally just made my own plan. So far so good. I still have to run electricity into the building.  Lots of work to do !!

Your comments and suggestions would be appreciated.

Monty