Good to hear. By the way, when drawing the path for the pipe, keep arcs to no more than 6 segments. The fewer the better. Also, when drawing the pipe with the script, change the segment count to no more than 12. If you leave them at their default settings, your segment and face counts will be huge. They'll get large anyway.
One thing you might conside doing to help control file size is make common pieces as components. Copy them as needed with Ctrl+Move to place them as needed. You could make standard elbows and wyes as needed. Straight runs can be as long as needed.
Also, don't bother with painting the pipes with colors or textures as that will also bloat the file size with little or no benefit.