Quest Web Parts do not currently support the SharePoint Gantt View. We have a Gantt Web Part planned as a future Quest Web Part. Until then, a potential workaround is to use the qListview to generate a Javascript Gannt chart using the "Custom Display" option. Here is a link to a pure JavaScript Gantt Chart:
You can use the qListView Custom Display Header Section for steps 1 through 4 and the Body section for step 5, Step 6 would be in the Custom Display Footer Section.
Curtis Kelly
PM, Quest Web Parts for SharePoint