Rebuilding "Ms. Merry" The Amerigo - Updated 05/29/2021

Steel and copper makes electro-corrosion, who might not act very fast, but it will be time bomb. Brass has copper in it, so on smaller scale will do the same.
I am big fan of copper plumbing. With copper tubings you can go smaller size than plastic, while still having the same flow.
I was restoring 1964 Airstream TT with copper, few years ago and just for the test, hook it up directly to 150 psi city water.
The plumbing hold it just fine. But the aluminium toilet pedestal turned into dust.