I will build a custom shopify section editable in the theme editor

Your theme almost has what you need, but not quite. The layout from your mockup doesn't exist, the closest app costs a monthly fee and adds another script, and editing theme code yourself could break the store.

I build the section as one self-contained Liquid file:

• Every option is a setting in the theme editor, so you change text, images and colours without code
• Blocks and a preset, so it shows under Add section
• Scoped CSS and small vanilla JavaScript, no jQuery and no external scripts
• Safe to use more than once on the same page
• Accessible markup, keyboard support and reduced-motion support for animations
• 0 errors from Shopify Theme Check

I install it on an unpublished duplicate of your theme. You preview it and publish when you're happy.

Good fits: a "worn by customers" gallery, a comparison table, a size chart, a bundle block, a countdown banner, a custom FAQ.

Not included: apps, checkout changes, backend integrations, vintage themes or headless stores, copywriting and images.