I can recommend all of the following sites (although usual disclaimers apply, Caveat emptor!).
I’ve been using a Celeston 9¼” Ultima since it first came out (circa 1996), althougn I’ve replaced the original fork mount with an EQ6 SynScan.
I made their 18″ example, a photo of my Mark II version is right.
Although they did provide some excellent advise and some hard-to-get components.
Great scopes, although I do not own one, however I do own their fantastic EQ6 SynScan with my Celestron (see right).
I’ve not bought from any of the following but I’d like to one day buy an orrery (although usual disclaimers apply, Caveat emptor!).
Beautiful mechanical orrery manufacturer based in Australia.
Beautiful mechanical orrery manufacturer based in China.