NoJoy,
I have no idea what your objectives are WRT Neptune Aviation...
I have a great deal of respect for the pilots who do the aerial tanker mission, but the accident rate is absolutely horrific. Try Googling "Neptune Aviation accidents" and you'll see exactly what I'm talking about.
In one article the company was saying something like "Last year we flew 2,500 hours without an accident"... like that was particularly good!. YGTBSM.
If you're looking to build hours, I'm sure that would be very challenging, and very rewarding in some ways, but definitely not easy.