I wanted to make the birdcage channel to be formed like a nose rib in the front. I first made a 3/8" plywood rib form. Then I made a forming tool to support the sides to prevent buckling as it bent while I formed the curves required . I then found that the leading edge was sharper than my forming roller so I made a 3/8" thick plate to form the leading edge area that would support the inside of the curve. Some forming and clamping was required but the combination worked out fine.