I do think the lines connecting a person to the parents are needed too. In a table that might be difficult to achieve though, although it does seem there is space to add them.
If you don't use a table, you directly draw on a surface boxes and lines, and you can draw everything then. See eg the fanchart in gramps40/trunk.
I see you work in windows, so I assume you use gramps34. The way of drawing completely changes when going to gramps40 due to the change from GTK 2 to 3. From that point of view, using gramps40 for complicated new views might be better :-)