Oh, and about applications, Maniphest sure, followed by Files, then Mockups, perhaps. Paste... maybe.

The description posted above looks like a good first version.

That sounds like a poor field name for users...

Objects which support spaces get a new "Space:" control on their edit forms.

In concrete terms, major items here that we know about specifically are:

Thank you, that was fast. We'll see.

Very roughly I'd guess this is somewhere in the 80-120 hour range. D9204 is a very bare-bones technical implementation which attempts to show that the feature is possible, but this needs a great deal of product and integration work on top of that.

Would you be able to give a rough estimate for paid prioritization of this task?

Basically the short answer is, if you need clean/simple creation for "non-company" folks, that to us is Nuance, or maybe also Spaces depending where that goes.