yeah, the fuel tank will stay, without the fuel tank, the helo has a time range of 1 and a half hours out to target, a 30 min loiter time, and then 1 hour 30 back...
With the fuel tank the time in and out are increased to 3 hours... so you can see why it will be needed, i appreciate that the ofp islands are only small, but for the purpose of ofp, you want the longest loiter time possible...
as for the ammo boxes, they would not make any difference to the total no of people the helo is able carry, this is for the reason, that to have the proxies placed so that the units dont overlap (look in the bis uh-60, and the guys in the back, their shoulders are all merged into one and it looks crappy...)
we can still only have 2 people per side, and that would give us a maximum of 9 people anyway, so there is no real advantage to add these extra polys, pushing the count up and up (it is 4200 atm)