You seem to have found the solution already, using CAD is the best way to know if it is buildable before you try to build it.
Though to add on, this post from a while back has a pretty good catalog of a lot of drivetrain configurations and provides some good commentary on each of them. It is slightly out of date, as the meta has shifted to faster drivetrains and 5.5w motors are now legal, but is still a pretty useful resource along with this thread.