Front-End Demo Site Builder with Custom Onboarding

We're looking for an experienced WordPress developer to build a custom front-end onboarding and demo site preview system.
The goal is to allow users to:
• Sign up and create an account
• Preview a fully functional demo WordPress site
• Customise key content (text, images, branding, colours, logo, etc.)
• Do everything via a simple front-end interface
• Avoid touching WordPress admin, code, or backend settings
What We Want to Achieve
When a user signs up:
• A new WordPress instance (or cloned template site) is generated automatically.
• The user is redirected to a custom dashboard (not default WP admin).
From this dashboard, they can:
• View and edit Pages and Posts available on the template
• Edit predefined text fields
• Upload and replace images
• Update branding (logo, colours, headings, etc.)
Preview changes live
The demo site updates dynamically based on their inputs.
The UI should be simple, clean, and non-technical.
Techni...