Shopify Single-Product Site & Portal. THE GRUNGE BRUSH

I need a clean, conversion-focused Shopify build for one flagship product that comes in several variations. The entire site should be geared toward driving sales, so every design and UX choice must support a smooth path from landing to checkout.

Core requirements
• A public storefront that highlights the product, its variations, and social proof, all optimized for speed and mobile.
• A secure dealer portal where approved resellers can log in, view wholesale pricing, place bulk orders, and download marketing assets.
• A watch it work hyperlink, placed prominently in the homepage banner, that links to our commercial-style YouTube video. The link should scan flawlessly on both desktop and mobile.
• Seamless payment, tax, and shipping setup for our target regions, plus basic on-page SEO so the store is ready to rank from day one.

Acceptance criteria
1. Store passes Shopify’s speed and accessibility checks.
2. Dealer portal is fully functional with role-based access and easy product re-ordering.
3. QR code is embedded in the hero banner, tested across common devices and browsers.
4. All product variations display correctly and calculate price, inventory, and shipping in real time.
5. Site is delivered with a short Loom walkthrough explaining theme edits, Liquid sections, and key admin settings.

If you’re confident with Shopify theme customization, Liquid, and portal setup, I’d like to see examples of previous single-product or B2B builds in your reply along with an estimated timeline.