Parametric Rhino Model for Prototyping

I need a clean, fully parametric 3D model built in Rhino (preferably Rhino 7) using Grasshopper, with the sole goal of rapid prototyping. I will provide sketches, dimensions, and target tolerances; you will translate them into an editable Grasshopper definition and a watertight Rhino file that I can tweak via simple sliders instead of rebuilding geometry.

Because the focus is prototyping, the file must export to STL without repair and pass Rhino’s edge analysis. I do not need textures or photorealistic materials—function takes priority. Please keep the Grasshopper network organized, grouped, and clearly labeled so I can understand and extend it later.

Deliverables
• Rhino .3dm master file
• Grasshopper .gh file with labeled parameters
• Brief PDF or screenshots explaining each parameter group

Acceptance Criteria
• All key dimensions adjustable within ±0.2 mm of supplied spec
• No naked edges; model confirmed watertight
• Exported STL slices cleanly in Cura (or similar) without further fixes

Share a sample of previous Rhino + Grasshopper work aimed at prototyping, and we can get started right away.