Can I suggest an alternative approach to your challenge. The best efficiency/ lowest cost per kWh with a diesel generator is gained when operating at a high capacity factor, for limited running hours. You could just purchase a diesel generator of between 60 - 100kW and combine this with an inverter/ charger and battery system of ~40kW capable of operating in parallel with your generator. I'm thinking specifically of the Sunny Island Inverters as per this link (I'm assuming that from the voltages you mention that you're in N America)
These inverters include a control system that will start and stop the generator according to parameters that you can programme in. Under light loads (with the battery in a reasonable state of charge) the inverter can provide the power. At higher load levels (pre-settable), or if the battery is becoming discharged, the generator is started and the inverter synchronises with it and transfers the load onto the generator whilst simultaneously using the spare available capacity of the generator to recharge the battery. If the load exceeds the generator rating, the inverter contributes to make up the shortfall.
I've personaly designed systems like this for island communities and can testify to their effectiveness. They have an added advantage in that it's very straightforward to integrate distributed renewable power sources (PV/ wind/ hydro) at any point in the future to give fuel savings. Remote communication capabilities are also available.
These systems also lend themselves to distributed load management, and if spare capacity is available, additional loads such as water or storage heaters can be automatically switched on. The following link gives further system information which may be of interest:
Good luck with your scheme.