"Drive Distance" in Direct Mode

I have a pen plotter program that I've come back to. It works virtually. The Vi sends out: a Pen Up or Down number, an X axis number, and a Y axis number. These last two numbers are distances for lines that make up letters. I don't know if I have an up to date LabVIEW add on for NXT Direct Mode Programming.
My vi might work if I could use a couple of "Drive Distance Motors" in Direct Mode. Do they exist? Also, What is the limit on how big a vi can be? How many structures can one use ? Is memory the only consideration?
Attachments:
PenPlot.vi ‏31 KB

You asked about the type of motor. I've used the three servo motors that come with the Lego NXT Mindstorm Education Set. I wrote the attached program for a Lego Pen Plotter I saw on YOUTUBE. I'll see if I can attach a picture. The name of the designer of the Pen Plotter is with my saved emails. I regret I cannot give you his name while I'm writing this. If you need it let me know.
Thanks for reading and responding to my message
N.D.
Attachments:
image.jpg ‏248 KB

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