You say there is no need for the neutral but how are the generators wired? Y or Delta? IF they are connected internally Y then you must take the neutral at least to the main disconnecting means and ground it or you will have issues in a fault. After the main switch the bonding system will carry fault back to the ground point to operate the protection.
Without a star point then the ground is more like bonding and a ground fault detector must be installed somewhere appropriate.
I have not covered a lot of the details regarding the transfer switch and whether a 4 or 3 pole transfer switch 1 or 2 electrode systems, open or closed transition transfer switches etc.
