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Those sound like very short, weak swing arms to me. If you had another set, about one wheel radius above the first, you might have reasonable A-arms. Bamboo or wood, plywood would not have an efficient arrangement of fibers to take the stress.
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I'm thinking of a rectangular sheet with triangular cutouts to give a diamond-shaped chassis with arms that reach to the center on the sides. The plywood is available in vertical grain, the way it's used in balsa/fiberglass composites; and with choices of 1/4, 1/2 or 3/4" thickness the width might be 2-6". Wrapped in fiberglass?