Track my Project

This is a php project. You may use any of the frame works you are comfortable with. I have cancelled my previous project and reposting with a little better spec. Track Current Projects: I run a steel detailing office remotely. I have mutliple projects running simultaneously My problem is that I am unable to track effectively the total hours spent on any project. Because ther could be multiple resources working on the project. Resouces may be pulled into the project as and when needed. Also resources may stop working on the project if that is what is requrired There will be a mainmodeller and a guide for every project. The guide could be the main modeller Extra Bilable hours We normally have extra billable hours in the project. This is usually due to Client changes. The resources in the project should be able to specifiy whether some of the hours spent on the project is extra billable. Quote Estimate and Modeller Estimate We quote for the project based on an estimate. However, when we start the work, the main modeller will be able to give a better estimate of how many hours the project will take. So the main modeller will enter his first estimate. However as the project progresses, this estimate could change. The main modeller will keep updating this estimate. I want to keep a history of these estimates. Reports I want the following reports Extra Billable hours. Errors on all projects or any project Filters I will require javascript or Ajax filters on All views. I tried to make it as clear as possible. However you have to use your knowldege. Table names and field names and table Structures I have listed the table structures as much as I know. I am not expert. But I am not compelte novice too. The frame work you use will require certain structure, certain fields and certain naming convention. Please use that. The openOfficeCal file basically shows all tables, views, reports I will require. Factor in about 50 hours of extra work because of changes. Quote you hourly rate as well as there will be changes requried. The framework to be used is any popular php frame work.