3D and Isometric are similar but for the most
part in hand drawing 3D is mostly "art" IMHO. I suggest looking to learn
Isometric drawing. With 3D you have perspectives and diminishing points
of view. With Isometric drawings the far end will look as tall as the
close end of an object. Easier to dimension IMHO and easier to draw
details. The 3D is really much easier to do with a computer doing all the
work.

Leon:

Ah, I had to look that one up. Isometric, eh??
I need to look more into that. Let me see what Joe and John's
recommendation has to say on the subject.
Thanks
Phil