Dolibarr CRM - Improve and customize email module.

Hello Freelancers, I am looking for experienced Dolibarr developers. Experience working with dolibarr is required. Here are the following things need to be done. 1. Complete customization of projects/opportunities module as per special needs of business 2. Activate and configure email module not only to send mass mail, but more important, to be used as a cliente email to centralize all comunications with customers and suppliers. 3. Either integrate with dropbox or use as a replacement of dropbox. So all files can be stored in the proper project file. Specially I am interested that the users do not have to save in dropbox and then upload to dolibarr but I would like that files can be saved directly to their "area" or "place" in dolibarr. I am expecting to have a good and regular comunication with the freelancer, to make sure, that work goes in good direction. We already have a dolibarr system installed but some work still have to be carried out.