Hi Dallas,
Over the years ,a lot of people have dabbled in some fairly respectable bi-planes like Claus Makis has created or Tom Dixons good flying ".38 Special" However, if you are looking for definitive answers and guidelines on what
"to-do" or "not-to-do" to create a "top-level" stunt-bipe then I don't think there are any to be had.
At the heart of the matter, as far as I know, no one has brought their passion, commitment, desire and ingenuity plus hard work to the process of creating an ultimate stunt bipe, in the same way a guy like Al Rabe did to the process of creating a "scale looking" plane that could compete at top levels.
Dallas , until some serious and commited empirical testing is actually done by someone that yeilds useful "real world answers" then arguments for, or against a top-level stunt-bipe design are at best just guesses.
Do research on existing designs, bounce your ideas off people on the forums, formulate your own designs and then test again and again till you succeed. That is the only path I can see to follow.
I want to wish you the best of luck with your quest for a top-level stunt-bipe.
Pat Robinson