If we have sensitive equipment and high precision sensors on board, very high current motor drives then making the chassis connected to gnd is looking for trouble, this way my big sheild will be acting as gnd noise pool affecting all other equipment and stopping it from being transmitted to outside world.
Anyway one company already connected the chassis to gnd of the generator and batteries. We are having alot of problems with no high current motor drives connected yet. I guess I will update you with results once the system is fully loaded and tested.
Mahmood