Welcome to the Forum. I mess with wing designs a lot. What I do is take a known wing plan from the FT free plans & adapt it into my own design that I like better. The pic is of a rectangle shape from a Simple Stick stretched from 36” wingspan to 48’ span & tapered out to the tips for improved roll control with the long wing. The FT Bloody Baron has a wing that you can cut from a single foam board. It has about a 29” span as I recall & about an 8” chord. DTFB is only a $ buck $, so I just redraw the lines I want right on top of the free plan (I copy the tiled plans on 8.5 X 11 paper & tape them up.) & if it doesn’t fold up right when I cut it out of the DTFB, I’ll just grab another board & try again.
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Note that on this plan I cut the the wing design in half & taped the halves on the DTFB then drew the new plan out on the foam board itself. You can stretch or modify it as you wish & it still fits on the fuselage design if you don’t modify the attachment points.
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Good luck, on the forum they often say, “Build, Fly, Crash & Repeat”.