Hi,
the application looks pretty straightforward to make. Since you want a web based application, I'd suggest to use JavaScript as a front-end, including 2 interesting libraries for graphics (free for commercial licenses). The first one is for line graphs displays. It is named JpGraph and is very popular for this as it is simple to use. Here is a link : [login to view URL]
The second library will be to handle the Excel like datagrid that you show in the requirements document. Even more options exist but Handsometable is again popular, easy to use and free. Here is a link : [login to view URL]
The back-end will rely on PHP and the "rndc stats" command output. By running this command at regular intervals, we can get detailed statistics on BIND usage during that time which include enough data to create all requirements. The web server will then push this data to Javascript for rendering.
Please let me know if you're interested in this solution as I'd be happy to work with you.
Eric