I have a lot of windows in my 1995 carpenter that I just don't need.\
Here's what I propose...
If nobody wants them, I'll just paint them black, epoxy them shut and glue closed cell foam to the inside.
If somebody wants them then we can do a swop... For each window that I swop out, a piece of fabricated aluminum 1/4 inch thick that will replace each window - complete with a bottom sill.
Ah, I see.
I'd think something measure in Gauge, not inches would be ideal if shopping for materials.
But yeah, some free 1/4 aluminum lying around is always nice.
14 ga is .083
16ga is something like .065, and a 16th is .0625.
I wouldn't even consider going with anything thicker than 16ga.
If you end up having to actually pay for it, I'd actually probably go with 18ga.
I *would* replace the windows *if* somebody bartered prefabricated metal replacements *or* waved sufficient quantities of the green stuff that it attracted my attention.