While it is possible to model a multi-ply header in standard orientation, header models still only allow for 1-ply design when considering lateral wind loads. Typically wind design (with bi-axial loading) has to be considered for headers, especially for large openings.
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I would vote for this addition. Our competitors do this with all their tall wall designs.
I think the challenge here is what fastening is required between plies to assume they act compositely. But agree that this would be super useful!