vTiger Multi-tenancy with Billing

If you have a demo to show a multi tenancy vtiger customization then you are just hired! I want to recruit only expert php programers having expert skills with the mentioned open sources. I would like to turn vTiger into a multi-tenant software, with a signup page for customers and a billing section included. - Multi Tenant Capability (Multiple companies can share the same CRM software, without interacting with each other's content) - Signup Page - Customers can signup for our CRM, for a free trial. No payment will be made on the signup page. - Billing - When logged in, users can see that their trial is still going and how many days remaining. Customers accounts are de-activated when trial expires and forced to pay, upon logging into vTiger to check their CRM account. We know a few companies who have done this and it didn't take much time, as there are many scripts out there that make Multi-Tenancy and Billing an easy add-on and a signup page is simply a php form, that writes to the vTiger database. Outrageous bids will not be accepted. If interested in working with us - please bid and let us know if your capable of producing this job. Please provide link to your demo.