Piggyback for Celestron SCT8i and SMC Pentax-F* 300mm F4.5 ED [IF]

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This is an OpenSCAD design for a specialized piggyback that allows you to attach a photocamera, typically a Pentax DSLR with the "SMC Pentax-F* 300mm F4.5 ED [IF]" lens, on top of a Celestron SCT 8i telescope, possibly other telescopes with minimal modifications. The design is fully parameterized for easy adaptation to different telescopes and lenses. Here's an English translation of the parameters from the file: d1 = 234; // Diameter of larger cylinder in base mount d1a = 228; // Diameter of smaller cylinder in base mount d2 = 64; // Diameter of lens tripod mount ring h2 = 13; // Thickness of lens tripod mount ring szer = 100; // Base width h1 = 50; // Base depth h1a = 10; // Width of thicker part of base h1b = 21; // Width of smaller part of base kat-sr = 17.5; // Angle of tripod mount screws (may vary), please experiment kat-pod = 0; // Vertical angle between main scope and lens - 0 means parallel