I need a clean, fully-parametric planter designed in OpenSCAD. All key dimensions—overall footprint, wall thickness, taper angle, and lip height—must be controlled by variables so I can regenerate the file for different sizes without touching the geometry manually. Here is the outcome I expect: • A single .scad file, logically organised and commented, that compiles without warnings. • Parameters grouped at the top for quick edits, with sensible default values. • Code structured so I can toggle optional elements (e.g., drainage holes, inner fillet, decorative pattern) on and off with Boolean flags. Please keep the script readable—no unnecessary nesting—and include a short note explaining how each parameter affects the model. STL export is not required; if the file compiles and preview renders correctly I’ll handle slicing on my end. If you’ve built parametric furniture, enclosures, or plant pots in OpenSCAD before, this task should feel familiar. Feel free to suggest refinements that make the model more versatile while keeping the code lean.