Always a scratch the head moment when you first start a new project getting it lined up and true.
I am sure you have it in mind but are you going to put at least one prop shaft support bulkhead across the beam so that you don’t get any prop/prop shaft whip/vibration?.
I would suggest one at the motor end where shaft enters tube and one on the plastic bulkhead former.
The running gear is quite a length from point of entry in the hull to each motor.
Just my thoughts.
Regards Bill 👍