I'm laying strips of 40mm Tamiya tape, poster sized masking tape would be handy though!! 
Haha! Oops, forgot to get that out of frame :
Cant be bothered to dig around for another pencil so i'm using my fiancees...! As cool as that would be, I think 12" wide tape would be a massive pain to use without wrinkling up on you :-\
It took a few hours to draw out and map the main pattern, and quite a few days to cut out, sub-divide and lay out the individual masks onto the hull. I'll end up doing 3 laps of masking for the 4 colours and then a couple of laps for touch-up's and window removal (which I'm actually really looking forward to!)
Cheers for the comments guys
Soong