Custom design configurator (Casetify-style), how do you build it on Magento?

Casetify built a ~$200M+ business on photo-upload phone cases. The configurator isn’t magic, it’s ~5 well-wired pieces:

• Photo upload widget, mobile camera + drag-drop. Validates resolution (minimum 1500×3000px for iPhone 17 Pro Max case art) and DPI (300 minimum). Client-side validation in Alpine.js, server-side re-check on submission.
• Live PDP canvas preview, HTML5 canvas renders the customer’s photo onto the case template (the device-specific cut-out + camera-hole mask). Hyvä Alpine state keeps it under 100ms re-render on every drag.
• Text overlay + design library, font picker (Google Fonts subset, ~15 brand-approved), color picker, monogram (initials + numbers), pre-made designs (clipart, patterns, emoji). Pull from Magento media gallery + a custom design_library CMS block.
• Print-ready export, on add-to-cart, the canvas snapshots to a 4500×9000px PNG/SVG, uploads to S3 (or Cloudflare R2), and the S3 URL attaches to the order line item as a custom option.
• Fulfillment partner pipe, order webhook to Inkthreadable / Printify / Printful / an in-house print press. They print, ship from regional warehouses (US east, EU west, UK, AU), and update the Magento tracking.

Build cost: ~$8k, $15k for the configurator + ~$4k for the fulfillment integration. Casetify’s lock-in isn’t the configurator, it’s the design library + influencer collabs + brand. Configurator is replicable.