Back of boat too high for outboard

Hello

I am a first time boat builder and a few years ago decided to build a 14’ jon boat with my dad. I just began shopping for outboards and found out the back wall is too high (32”). I was wondering how i should go about this, I purposely have not attached a bench on the back incase there were any issues with installing the motor. I was wondering if i cut down the back wall of the boat to make it fit how much space I would need to give around the motor to let ut turn and rotate without hitting the bench. Any advice is appreciated!

 

Need pictures and motor details.

 

Here's ABYC's recommendation.

 

Transom heights for various length outboards.
Short 15"
Long 20"
XL 25"
XXL 30"

It varies due to hull factors and motor manufacturers, and the cavitation plate on the outboard should be level with the keel bottom, or boat bottom if no keel. If you need clearances for tilting and steering the manufacturer will have drawings.