Not sure plywood would do much. it does bend, although, it might do something. If wanting to provide longer support, maybe a couple of wooden planks running lengthwise, the crossbeam across those? If you got your 2 crossbars 40 + inches apart, then there would only be 4'ish feet overhang each way
Re the UV protection, Hobie use incredibly UV resistant material. My Hobie outback is 9 years old and has lived outside it's whole life, and is still just as brightly colored as a brand new one. No discernible UV deterioration at all.
_________________ 2014 Hobie Outback set up for rod and longline fishing
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