Hi there, I see you mention Celestia. I’ve never used it myself but have looked at screenshots and read about it.

I built a WebGL viewer for our local solar system only[0]. If you happen to have the time to give any feedback I would sincerely appreciate it - you seem very knowledgeable about this.

[0]: https://orrery.ryboso.me/

EDIT: With apologies to OP, I don’t want to hijack your post.

I’m currently traveling without a laptop and can’t view your site on mobile - I would love to check it out and share my thoughts and trade experiences about building these space viewers once I have a laptop again in a couple days.