I recently posted the following elsewhere in a different topic, but it seems more appropriate here with everyone else's, So, Posted here with better explanations and eliminated unnecessary pictures
I built this for visual, for under $2,000. Including the PV. But I had to provide all the labor.
It was originally intended for a 16" dob with the possibility of a 20", but as you'll notice I ended up with a 14" SCT. Which it also works well for.
I specifically wanted to address several problems that I saw with my friends ROR
1: It got too hot inside - especially the big Dob mirror. So this is more open to natural air flow than usual, The two main features being a gap slated floor and an unusually overhung roof to protect a full length under eve's gap, well recessed and screened, that is resistant to even driven rain and snow.
2:Seemed like wasted space where the ROR went. So I added the "extra" structure. Much appreciated storage, and a dew protected area..
3: With a traditional 4' wall to the south, I couldn't see many important objects, such as the Trifid or Lagoon, or anything else below Dec -15. That had to change, or it wasn't worth it, hence the doors instead of a wall to the south, Strategically placed to afford minimum visual interference when in use.
4: I couldn't afford to get power to it at a reasonable cost, PV was cheaper, so had to be figured in. Later, I did bring electric to it, but it was added convenience not necessity
5: Ground thermals are often a problem with Dobs, causing self inflicted poor seeing, so I wanted above avg height from the ground. The open doors and slated floor drain and eliminate all thermals.
6: Many traditional ROR's have part or all of the south end triangle as a necessary structural component, which means it shears off anything inside that sticks up much beyond wall height. that had to change. Latter needed for the SCT anyway. Also with clear span head room, I could lower the side walls on which the ROR rode, making more sky available for a floor mounted dob.
7: I also put part of the side wall as part of the roll off roof, again helping lower the side walls for more available sky E & W
8: I wanted tracks that would be impervious to ice or snow, so shielded, underslung, "barn door" tracks, which I'm familiar with, were a necessity.