Active Collab Modules and Modifications

We are a digital agency who has started using Active Collab as its primary Project Management tool. While it answers most of our needs, we have found some areas where we would require improvement or extension of the system to get everything we need for our Project Management and Finance teams. We are looking for an experience PHP developer to amend the Active Collab set up with additional modules and extensions that work better with how our business operates. We have attached full documentation that explains how we want the work to occur. We need full references from you that display your experience. Previous experience in developing for Active Collab version 3 is preferred. We also require an initial estimate, preference given to those who cost each of the described modules and extensions separately.