Saddle + bridle fit configurator (gullet / tree / seat), what does it look like on Magento?

Saddle fit decides whether a $3,500 saddle sells or sits in the warehouse after a $400 LTL return. The Magento implementation:

• Inputs: gullet width (narrow / medium / wide / extra-wide), tree size (pony / cob / full / extra-full), seat size 15″, 19″ in half-inch increments, rider weight band, horse breed (Thoroughbred / Warmblood / Quarter Horse / Arabian / draft / pony), horse back type (high wither / flat / mutton / swayback).
• Output: filtered list of compatible saddles with a fit-confidence score (green / yellow / red), plus a “fit advisor will call you” CTA on $1,500+ saddles.
• Cart validation: incompatible combinations cannot add to cart without a fit-advisor confirmation. Cuts “saddle fit wrong → LTL return” rate ~40% in the data I see.

Built as a Magento custom product-options funnel + a small Hyvä Alpine widget on the PDP. Brand-specific fit logic for Antares, CWD, Bates, Pessoa, Stubben, each brand has its own tree-shape conventions, so the configurator branches per brand. For bridles the same pattern but simpler inputs (cob / horse / oversize + brow-band length + crown-piece type).