Papa,
Yup, I've found Testors MM flats go on great with a brush, with very little evidence. Sometimes there is a slightly thicker application of paint on the edges where two colors come together - like on the camo pattern. If it's noticable, I just wait till the paint cures, hit it lightly with the lightest sandpaper I have, & touch up with thinned paint if necessary. By the time a future coat and a dull coat are applied - it looks sprayed on.
I brush pretty much everything now - with the exception of the dull coat.
Medic,
I just used a nex #11 exacto blade and scribed along the already recessed panel lines until the blade popped through. Minimal cleanup was required. The kit comes with a whole bunch of extra parts for various versions of the Sea King. I've seen several sources of aftermarket decals for Italian, Australian, American and other schemes. I'm sure somebody makes PE and resin aftermarket stuff too.
Chris