Custom OpenSCAD 3D Model

I have a concept that needs to be turned into a fully parametric OpenSCAD model. I will share sketches and functional notes, and I want you to translate them into clean, well-commented code that I can tweak later if dimensions change. The final design must be print-ready and export cleanly to STL without non-manifold issues.

Deliverables
• Editable .scad file with clear variable definitions
• STL export verified for 3D printing
• A couple of rendered screenshots so I can quickly review the geometry

I’m happy to iterate together, but I’d like the first draft within a few days so we can lock in the core structure early. If you have prior work that shows parametric features, please mention it when you reply.