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I sympathize with the principle of going all-paper in the construction, but for a flyer it's troublesome: paper is way heavy, with no real rigidity in either plane. Pardon the pun.
Best thing to do is to "box" the fuselage - card on the outside, with a filler of some sort inbetween to make a stiffer ply: foam would be ideal (and you could just use bond paper on the outside, since you're just using the outer plys for shear strength), or a hollow outline of Bristol, with a couple strategically placed inner webs (and at least 60# cover stock outside). Solid inner plys of paper are just extra mass.
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