Hi Cpt. Birdspeed,
This is a fast calculation I made, base on your data:
DOW * * * * * * * * * *42,2
PAY LOAD * * * * * * *6,2
1013/ isa +15*
Crew 2/5
3200 nm
ALTERNATE
30 min
Hold at 1500' for 30'
Plus contingency 5%
Here my calculation
* *CLIMB
FL 360 ( almost optimum 360/370)
.78/280/250
28'
Fuel 2275kg
174nm
* *DESCEND
FL360
.78/280/250
25'
340kg
118nm
* * CRUISE
FL360
.793 long range cruise
3200nm -174-124 = 2902nm
Fuel req *17200kg
FF 1284 + 4.5% * 2 = 2683 kg/h
FT 6:30(around)
* *HOLD
960kg
* *ALTERNATE
FT 30'*
10000ft. Cruise
877 kg
TOTAL FUEL
21527kg +5% = 22603kg
TOW * *71003kg
Still have room for payload
I hope to help you with this data.. It maybe be not precise at 100%, feel free to correct if any error,if any I'm so sorry but I'm flying too much
Take care and happy landings!