# Erhu Visual BOM Brief

Generated images are communication aids only. They must not be used as
fabrication authority, dimension sources, measured templates, or substitutes
for DXF/CAD.

Concept image only; not fabrication authority.
Do not include cut-ready dimensions, hole locations, or toolpaths.
Fabrication dimensions are controlled by `cad/erhu-qianjin-scale-params.csv`
and future reviewed CAD/DXF or measured templates.

## Image-Generation Prompt

Create a clear workshop reference image of an erhu-inspired two-string vertical
fiddle prototype on a neutral bench. Show a slim vertical neck, two tuning pegs,
a small resonator body with a visible membrane face, two strings, a small
bridge, and a labeled setup strip beside the strings marking the
qianjin-to-bridge range of 380 mm, 400 mm, and 420 mm. Keep the view orthographic
or lightly angled, with clean lighting and no decorative fantasy details.

## Required Labels

- "Concept visual only"
- "DXF/CAD/measurements are fabrication authority"
- "Active scale: qianjin to bridge, 380-420 mm setup range"

## Do Not Show

- A long-scale string layout as canonical erhu geometry.
- Dimensioned body or bridge values not present in this packet.
- Toolpaths, cut lines, or measured templates unless derived from reviewed CAD.