Vtiger Customisation

vTiger customisation is required. Scope of work is to have the following modifications and or modules added to vTiger Over view - we currently moving from Infoathand CRM to vTiger. We have currently 4 users Hosting on own server Used on PC, Mac, Android, iPhone Requirement to develop vTiger to be able to use gmail email in vTiger. Each user has there own gmail login Each user has there own gmail SMTP outgoing server Each user uses different email clients Outlook for PC, Postbox for Mac regardless of email being sent from vTiger, email clients or mobile the email must be lodged against a contact record in vTiger and be in the email client, mobile Invoicing - Require to be able to Bill one Account and Ship to another account and or contact ie Invoice Acme Pty Ltd - goobledegook Rd Sydney, Ship to XYX Contracting c-/ Depot, Halls Creek, WA and Bill Acme Pty Ltd Sydney - Ship To Acme Pty Ltd Geraldton, WA Must be able to demonstrated extensive vTiger experience and samples of work