Please consider adding a separate page in PPO specifically for the Gantt chart. The tasks section on the Project >> View page may then be converted to a normal task list, with a separate icon on this page to access the Gantt chart.
The chart must make provision for:
1. Ability to collapse and expand sections (such as collapse the tasks under a summary task);
2. Freeze the headings on the page, to provide context when scrolling down;
3. Show a timeline to indicate today on the schedule;
4. Options to zoom / view specific sections in the plan;
5. Ability to show critical path.