Just don't include any of that stuff. I put that in there so that I could keep track of the party size, in order to check through each memberss HP and SP and display them at once. That is only needed if you switch between party members but want to display all their information at once on screen.
And what might be an easier reference, since you are making a one man HUD, is the default HUD code. It can be found in Blizz-ABS 2.55 part 3 lines 5166 to 6067. I'd recommend copying and pasting those lines into a new script, and starting from that, because it lags less, is neater, and is also much better suited to a one-man HUD than the one I made.