Thanks again for all your help. It was all your suggestions/comments that led me to the final solution, Solid Tools. I just found this approach to be less problematic, and I favor using native tools.
And, I fully agree with you about what happens on the job site. No tradesman I know, would ever think of cutting bevels on plastic baffle vents. I just think, that having a detailed drawing, adds a little professionalism to the construction drawing set. As you point out, there is a cost to this kind of complexity.
And, I found yet another solution from @Box, even simpler.
You can check out the details on another thread:
