well - sorta -but dihedral is very friendly - and weighs nothing- so do it .
My basic rules are simply to make you think.
If it is too heavy -it won't fly - so why bother with CG
If it weighs zero or almost zero and has very low wing loading - you can take extreme liberties with CG- we have been back past 50% of MAC- and -they are still flyable - you gotta watch em -but they still fly
enough power to overcome weight -easy one -it will fly no matter how badly the designed is bungled.
If not enough power to leave the ground - none of the other stuf matters.