Unfortunately i cant take the credit for that series of videos they where made by Lewis-White-FX.
I think he has a account here too, but cant remember his user name 
As for the amount of paint you need, i seem to remember using around 2 tins of the green 78, silver 11 and grey 79 .
I would order 3 tins of the major colors and then 2 of the minor to be on the safe side.