first what do you want it to look like? secondly are you willing to
trade time for bucks?
cheap material may mean 5 times longer to install
whats the use of the barn when you are done? animals or people?
I assume that would be "gable", and how big is "huge"? What is the
structure/spacing/etc., and is current siding structural or simply
cladding? Too much unknown to know what would even work.
As for "cheap", probably can't do much better than factory
seconds/blem's from the sheet metal folks. Of course, it won't have
warranty, may be mismatched/off color, etc., etc., ... Otherwise,
perhaps you can find salvage material locally.
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