Charlie, I made these racks as a weekend project. Oak slats and blocks purchased at Lowes home center. A few holes bored on the drill press, some stain,screws = Wall mounted shell racks. The basic idea could be modified to suit your needs. HTH
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"Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy