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Having had to improvise assembly myself, my advice to you is to assemble the "center" strip consisting of the roof, back, and lower back pieces first, then assemble the left and right side halves separately, and attach them to the center strip. The peak and chin then follow last. Keep in mind he's made the chin removable and able to attach magnetically.

ALSO: advice to anyone having trouble finding tension pins: 10 gauge wire cut into small lengths fits right into the pinholes for this piece, of course they don't tighten but they hold it together well enough for me to superglue the pieces together.