That is my thing as well. I always felt like Engineering was too small at times for the type of reactor supposedly used.You can whatever you want, but that cutaway was the first time I actually felt the engineering section on a starship made sense. When I see how much room there always seemed to be in the secondary hull on all those schematics, I always felt it was weird. The amount of space taken up by engineering, deutiriumsupply, impulse engines and all always seemed so little.
Here, it feels right. To me anyway.
I personally really like the Kelvin Enterprise design, including Engineering.