Feasibility and Development of Client Portal (SharePoint)

We are a bid and tender management company supporting clients who outsource their bid writing. We are looking to move to a more intelligent platform to manage the sharing of information between clients and our business. We want to enable clients to log into the portal to submit documentation to us, access discussions on the progress of bid activity and view account details i.e. invoices etc.

What we require?

What server capabilities do we require, is offsite hosting better?

What is required to develop the portal?

An indicative cost and implementation plan

It is likely the supplier who does the initial feasibility will be invited to implement the project should we decide to move forward.

We are expecting a 2 page report covering all areas above.