I'm working on a work that's set in a universe of an existing, fictional work (basically, a fanfic).
My goal is to explore the worldbuilding of that work's Universe in a direction where the original creator pretty much left things mostly to imagination.
Is asking questions in this context on-topic?
If so, is it preferable to honestly state what the Universe is (which - if no other benefit - instantly offers people familiar with the works many many details of the world); or simply describe the relevant details of the World without mentioning it's based on a published work?
As a random example, I would like to ask a question asking about how would a specific detail of Heinlein's Starship Troopers world work. This is clearly offtopic for SFF.SE (as I'm interested in a hypothetical, not in-universe or RAH facts); but seems fully ontopic here, if not for the fact that the world I'm "developing" is not originally mine but Heinlein's.
Another example: (more fanfic friendly :) - what jobs could a pure-blood wizard do, if they wish to (a) live in a Muggle world; (b) use magic to help them in their work; yet (3) Not get Ministry of Magic repercussions by violating secrecy.