Please, I never said it worked, you are now quoting other people, not me.
You have the aluminum, you are arguing my opinion (just my opinion). The machine will function with aluminum tubing, in my oppinion it will not hold up in the long term.
This is very simple at this point, try it. Tell us how it goes, maybe I am completely wrong, maybe I got crap aluminum when I tried it. This is a DIY project, do it yourself and see. No harm done if it works.
Please join the community here without an attitude, everybody here is super cool all kinds of cool things happening both in hardware and software, all for free.