Multi-Module .NET Travel Portal

I’m building a new travel portal that should feel and flow almost exactly like Onetravel (about 90% of its current UX), but written end-to-end in .NET with Bootstrap so the layout stays fully responsive on every page.

Core flow
From Search → Listing → Detail → Add-On → Contact → Payment → Confirmation each module has to work seamlessly. For the first milestone I need the Flight booking piece up and running before we expand to Hotel, Car, Bus and Holiday packages+ an Android app for the same

Flight module must include
• Search flights
• Flight details page
• Add-on services (bags, seats, meals, etc.)
• Contact
• Payment
• Confimation page with Email to user
• Data Saved on Google Sheets as Tables

Under the hood
• Mock but secured API layer for all calls
• Payment-gateway integration plus SMS registration and email notifier
• Every transaction read/writes to Google Sheets (no SQL server for phase one)

Admin panel essentials
• Manage custom markup & service fees
• Theme customization
• Add/manage Holiday packages, Cars and Buses
• Full editable source code delivered so I can extend features later

Deliverables
1. Working .NET solution with the Flight flow completed and demonstrable in a live or recorded demo
2. Bootstrap-based front end matching Onetravel’s design language (colours, layout, UX cues)
3. Admin panel with the controls listed above
4. Clear setup guide and all project files

I’m starting on a tight budget, so creative re-use of components or a solid template is welcomed. Impress me here and there will be long-term feature work, new modules and higher-paid phases coming your way. Please share any relevant demos or screenshots when you reply.