You will find very quickly that a flamer build will simply not work vs high level players with chem spray.
It is not that you can't overwhelm them with carro/flamer eventually, its that you cannot do that before you die to say, a metamidion.
The junker is a great ship still imo but I prefer artemis + hades for a sniping side, and good old fashioned meta on the other.
I will say though that carro+flamer will destroy any and all pub matches.