I want to set up a freelancing job portal

Hello,
I want to set up a fully functional responsive freelance job portal.
The site should be similar to PeoplePerHour in functionality.
I want to start with a lowest budget possible using the best freely available plugins.

I need following things to be included:

100% Customizable
Email Notifications
User Dashboards
Admin Panel
Paypal Integration
Unlimited Projects
Blog
Search with Filters
Categories
Filter by Skills
CMS to Manage Content
Country Flags (Auto)
RSS/XML Feeds
Site Statistics
Social Sharing
Multi-domain license and support
Slick Design
Dispute Management
Improved Search
New Home Panels
Facebook Connect
Escrow Payments, Milestones
Reviews, Rating
Favorites/Watch List
Maintenance Mode ON/OFF
Featured Projects
Report Abuse/Flag
Invite Friends to Bid
Advanced Admin Panel
Workroom with PMS
File Sharing with Multi-Upload

Please answer following questions with your proposal
1. Do you have similar experience?
2. Can you guarantee the quality and functionality of the site
3. What will be the final cost, including your fees for running this site.
4. I will give the details of name and features after approval
5. What will be your timelines?
6. Can you assist me in further developments at later stages

Give me your best quote and timeline.

Best Regards,
Savitri