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Manta are folded from a single square, though I did laminate a black sheet to a white sheet in order to get different colors on the top and bottom sides of the model. For larger models, I used both wire and foam insulation for additional structural support.
Finished size: 33 inches long x 27 inches wide x 7 inches deep. $105.
Current size and configuration is very expensive to ship. Working on a solution.