Google Sites Digital Shop Design

I need a complete e-commerce site built on Google Sites that will let me sell downloadable digital products from day one. The visual style should be clean and lightweight so pages load fast, yet feel professional enough to inspire trust at checkout.

Core needs
• A home page that introduces the brand and highlights best-selling files
• Product pages with screenshots, feature lists, and instant “Buy & Download” buttons
• A secure checkout flow that supports major cards and PayPal, then automatically delivers the file via email or on-screen link
• Simple inventory management so I can add or edit products myself after launch
• Mobile-responsive layout that displays perfectly across phones, tablets, and desktops
• Basic SEO setup (titles, meta descriptions, friendly URLs) to help the shop rank for my keywords
• Google Analytics connected for traffic and sales tracking

Because everything will live on Google Sites, please outline any third-party payment or file-delivery add-ons you intend to integrate and confirm they function smoothly within that ecosystem.

When you send your proposal, let me know:
1. The toolset or add-ons you recommend for payments and secure downloads on Google Sites
2. A timeline for design, revisions, and final hand-off
3. Examples of other Google Sites or lightweight e-commerce builds you’ve done

The final deliverable is a fully functional, launch-ready Google Sites storefront with at least one live digital product so I can test the purchase and delivery flow before we close the project.