G'day John,
I found a lot of good information about dome/observatory designs from this site -
http://obs.nineplanets.org/obs/obslist.html
... many, many hours of reading will bring you up to speed. Over the years and in the end I went with Sirius/home built design and progressively automated the lot.
http://astro.yorkcreek.net/Observatory.html
Hope this might guide you.
Regards, Merv