I originally wanted some guevesas for my Tau, I have a couple converted with pulse guns. Then the men of the imperium just started to multiply like a disease. They are just too fun to collect and paint. They will be my Planetary Defense Force for my Tau planet. The army is infantry based as you can tell, I will add more when they are done.
I haven't thought about drilling the barrels, I may go back in the near future to do that after some practice.
Which flag are you refering to? If its the tan looking one: prime black, drybrush codex grey, drybrush commando khaki, devlan mud wash, after it dries, some more khaki drybrushing, then the other colors: taucept yellow, then mud wash, carefully drybrush shinning gold, then gryphon sephia wash etc.