I would recommend some drafting education, for anyone who hasn't done this in the past. Previous experience may have been in high school and this may amount to just a refresher, but in the time it takes to look for a software package, someone could learn to do an isometric drawing with correct dimensions. A small-ish board, some triangles, a t-square, some vellum and pencils are cheap and it's a good skill to know, anyway. Plus, if the software turns out to be a PITA, stops working, takes too long to learn or can't save in formats used by others, paper still works fine.

It's not just you and Ernie- I would bet that most CI could use something like this, but lack of time, drafting experience or the program's learning curve may be a problem.

Has anyone asked a cabinetmaker what they use?