Well Chris, I put foam and a layer of glass cloth on my fuselage from the firewall, back to the rear spar/ seat area. This was in part to stiffen the forward fuselage, as I have a retractable nose wheel / gear. I never heard of flex being needed, and I don't know who the experts are. Does it add weight? Yes, but you, and you alone, must be comfortable with the strength of your finished product.
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