Creation of theatrical properties, or props, is important to movie making. Are questions related to them and how to create/maintain/dispose them on-topic here?
The site is about video/audio production, not "movie making" in its entirety. The focus is on the "studio production" side to it, although there are some exceptions where the basic problem domain is the same (live sound, shooting video on location, etc).
I think making props should be off-topic here, unless the question is about how making those props will affect production - for example, a question about how different prop materials will affect lighting would be interesting.
As a comparison on the audio side, we have lots of questions about audio production but we don't discuss musicianship outside of a studio/recording context - we have another site for that.
I don't think prop questions are explicitly on topic here (just my 2 cents). However, the argument can certainly be made that props are a part of video "production", if indeed there is recording happening.
Quoting an answer by Atwood, as long as there is,
at least some semblance of a defensible connection to production
you should probably be safe.
Secondly, yet another Atwood answer is, I believe, pertinent...
The general guideline we use is that experts using the site would not be turned off or turned away by the presence of this particular topic appearing on the site.
Of course none of this definitively answers your question :) But those two quotes should give you a bit of support if you decide to post your question and get some push-back. I can't say I wouldn't push back a bit myself though... depends on your question. :)