I think I'd be great to have a section in the marketplace where people can post ads for cases, enclosures, etc in the various modular formats. Not sure how easy it'd be to set it up to be as sophisticated than for the modules but at least having a forum subsection for this would be a good start. What d'ya think?

I'll second this. In fact, having an overall "not modules" section for modular hardware to cover things like cases, rails, power supplies, patchcables, etc would be a smart idea.

+1 for me too!!

And why not just any audio equipment? It's all related :)

I am taking commissions for synth builds. UK ONLY for now. DM for details :)

You can find my modular synth album here https://kel-audio.bandcamp.com - enjoy!

+1 here too, great idea !