Minimalist Horsebox Marketplace Build

I need horseboxsale.com built from the ground up as a dedicated marketplace for buying and selling horseboxes. Think of the core flow of dragondriving.co.uk, but stripped back to a clean, minimalistic interface that feels noticeably more professional and purpose-built for this single niche.

Key functionality I must have:
• A robust listing system so sellers can add, edit or remove horseboxes with photos, price, spec and location.
• Advanced, multi-criteria search filters (make, model, price range, regional radius, etc.) that return results quickly and cleanly.
• Secure user accounts with profile pages for both private and trade sellers.

For communication, every listing should offer an on-site messaging inbox while also letting the seller decide whether to show their phone number or email. All conversations need to stay tied to the user’s account so I can track and moderate as needed.

Please build it fully responsive, load fast on mobile, and make administration simple: I want to approve or reject new listings, spotlight featured ads and see basic analytics from one dashboard.

Deliverables I expect:
1. Design mock-ups confirming the minimalist look and feel.
2. Full website build (front-end + back-end) on a platform you recommend, deployed to my hosting.
3. Handover of source code, documentation and a quick call or video walkthrough showing me how to manage listings, users and messages.

If you have recent marketplace examples—especially vehicle classifieds—share them so I can gauge fit. Let’s get this live quickly and cleanly.