I think it must be like MS Project printing, where you can print tasks and Gantt diagram for all or specific time. Ms project may be is not the best planning tool, but printing is great!
Major thing for Big Boss is "ok, i can see it on the screen, how can i print this for outside peoples or send this diagram by e-mail?"
May be first version can save as PDF/XPS and than print using 3-party application. Major thing in printing project - correct multipaging and selecting paper format and page orientation. Same project can be printed for one boss in A4 portrait (without diagram, for example) and in A3 landscape for other boss. Telerik Reproting framework
has not elemts like "task table", "legend", "milestone", "relations" and so on.