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Glen,
I've built a few observatories....
the wall height will depend on all the factors mentioned so far...if your surrounding area allows it then a 1.5m wall with sliding/rolling roof section to take it high enough to clear your largest scope (say 0.5m) gives a usable 2.0m overall height.
If you're closed in by other building etc. then obviously the benefits of a lower wall are lost.....then the compromise may be 1.8mm wall and work well above the horizon.
Many years ago I built and octodome on a 3 x 3m breeze block base.
The wall height was 1.5 and the dome just less than 1m. One of the eight panels had a double hinged door (1.2m wide) handy when looking at the horizon. The roof shutter was the same width and rolled on heavy duty sliding door tracks to clear the zenith. This was controlled by a pully system. Easy!
I used this of a few years with a 12" f5 for SN search. No real issues, no drama, it just did it's job.
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