And if you get around to mineral casting, make have a look at the
Stainless Steel - Quick and dirty flex test .
Know the thread…its the quick’n’dirty that bugs me. And that i comes down to EMT vs Stainless…that however is not up for debate in my case as i have the pipes and want to improve on what i have and not just build a new machine from scratch. And maybe try some dumb stuff that noone really cared to warn me about…
I have a metric f*ckton of unqualified/anecdotal assumptions about how piping with certain mechanical properties would/could/might/should behave under certain forces. But i cant prove any of them, and in terms of casting i have seen noone actually do the math, yet link some scientifically solid sources.
And that isn’t surprising if you consider that even mineral casting is a discipline of its own…mineral percentage of the entire mixture, mixture of grain sizes, what grain sizes…it’s not really just “sand and epoxy”
Either i’ll just do it some day and put up some pics (filled vs. unfilled) or someone else does…but right now i’m waiting on the 25mm primo and put some serious energy and hours and whatnot into some little yet long term “project” my wife gave birth to five weeks ago 
I don’t see anything substantial happen until the primo is released, primo parts are printed and i have to tear down the burly. And if the pipe in pipe solution works, is just might skip mineral casting altogether…