Thankyou Junichi for your positive comments, they could not have been drawn without your stencils.
I have been using Visio since version 4.1 and when I found your stencils & fonts it gave me a new impetus to try and create some novel training material, although I am now coming to the end of my working life, I still enjoy using the program.
Attached another drawing you wish to view
I have been working for some time creating cut away diagrams in Visio, see the second attachment,(although it does not show up well as a twice printed pdf to reduce the size).
I now have to work out how to create the same type of cut away using Isometrics