It sounds like you're describing
my HUD, which is available in that thread or the
repository and will work just fine on a Mac.
Some useful background though: Each box in the PT3 Hud is its own Group. Groups can either be on table groups or popup groups. You can have as many groups as you would like, and as many popup groups attached to a single group as your computer can handle. So if you wanted to build your own HUD with three separate boxes, you'd want to create three on table groups, then position them by right clicking and dragging during play. For more on Hud Groups, see the
Tutorial: Managing HUD Groups.