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I used 16 gauge sheet arn, available at your local sheet metal shop.
Thinner will work (maybe 20 gauge) but I like 'em sturdy.
My guess is that most of what you are replacing is pretty flat or maybe
one bend (which your shop can do cheaply) or at the worst form it into a pan.
That is what I did - slotted the corners and welded them up on installation.
If you are recently into bifocals it may be a challenge to see what you are
doing. There is a pretty wide range of viewing distances involved, all
requiring sharp focus.
--
George Downs Bartlesville, Heart of the USA!
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