Hi Todd,
I agree that reviewing the data is important and your ME/SE summary concludes why I decided to do this project. The design of most light twins is what realizes the data you are speaking to. And, this is why I said :"well designed twin". I'm not a fan of conventional, small under-powered twins that can turns things more deadly when an engine drops out.
Yaw... After the data has been calculated, then its time to test fly. As I mentioned, the test flight of one of the twins that were made, had rudder authority, with an engine down and still spinning (worst drag configuration), to canard stall speed... which is another reason I took up this challenge, with this configuration of aircraft. Even with demonstrated stability and rudder authority to canard stall, we are running our rudders to the top of the vertical fin.
With VMC at, or below canard stall, I think we have a robust flight envelope for a new light twin. This is not a new revelation... Velocity Twin.
Of course, any aircraft design project should be undertaken with adequate research and engineering... even more so with the complexities of a twin.
It is very rewarding to be a part of our general aviation community, where we can still collaborate and, leveraging the knowledge from those that came before us, try new things.