New pan build questions; copper vs SS, thickness?

[maple75]

I am considering building two 2'x2' flat pans.
I have the resources to build them with either silver soldered copper or tig welded stainless steel.
Is there any health concerns with using copper and silver solder pans?
Is sagging a problem?
What thickness material is recommended (for either copper or SS)?

[Russell Lampron]

Go with the stainless, it's easier to clean. The copper can't be cleaned with anything strong like vinegar or pan cleaner.

[brass maple]

It is a decision that will be harder to make. Copper is a bit harder to clean but has way better heat transfer than SS.
SS is a bit more durable and can clean easier.