prob14.jpg
Don't you just love CAD drawings? Everything is dead-nuts and as you said, it drives some people crazy trying for perfection.
I copied one of your photos so I could add some comments.
First, the plywood block is there to provide a larger glueing surface and to provide strength to the joint if someone were to "squeeze" it together from top to bottom. With that said, all glues have some degree of gap filling capabilities so the closer you can get to the lines the better.
1. The contact surface is between the cap strip and the plywood. When you clamp it you should contact the whole length in this area. If the plywood dimension is too great, it will stand a little proud and leave a bump that will need to be removed. Easy enough with a disk or belt sander and the material removed isn't enough to worry about.
2. I assume the radii are from the router. Adjust the end of the cap strip to match this area.
3. If this end is a little long, it won't matter other than the extra weight. You might consider cutting it off even with the edge of the plywood doubler.
So, to answer your original question, use what you have and smooth things out after the glue dries.
Jeff Moore