Actually Greg, you have inspired me already before you posted here, lol! I saw some of your videos on youtube and have enjoyed learning from them. The link you provided clears up all the questions I had for you so thank you very much for your time and info.
Specifically I'm looking at making nesting fixtures that have the shape of each part that I'll be engraving and those will be interchangable on top of a main vacuum housing. If that makes any sense. lol!