Yes, on an oval, your forces are different , that's why I put round in brackets, however, I doubt very much that you'd have problems with resin, especially uprights since the UV rays don't hit it directly to begin with because of them being vertical.
Just my 2 cents, but a resin structure really won't give you issues, even over the long term - wall will still be steel and bottom track will Never rot or corrode out of resin.
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