Thanks guys. Geo, yes, I ended up using a combination of masking techniques, including using the full scale colour drawing provided by Tamiya. For the wings, I applied some wide kabuki tape onto the drawing and, because the tape is somewhat transparent, I traced the camo pattern onto the tape with a pencil, peeled the tape away and then cut the pattern with a scalpel. This technique is OK for the flatter areas but for curvy parts like the fuselage we need to compensate for the curve and that's why I tried the bendy tape there.