I was recently asked about how to display a custom Gantt bar in one of the PWA Gantt chart views. At first I did not see a way to do it but then tested and verified that the Duration1 –Duration10 bar styles available in several of the bar sets in PWA can be used. I had some some reading on the Internet that implied that they were non-functional but I found that they draw using the StartX-FinishX date sets for tasks. So Duration1 is drawn from Start1-Finish1, Duration9 between Start9 and Finish9.
Server Settings | Gantt Chart Formats:
Then this project draws like this: