There is a way around the intake issue but you would have to buy another kit, Revell took over the moulds from Matchbox and reissued it as a German BGS variant with extra sprues for the intakes and the enlarged sponsons amongst other things, this will show you the one I mean, though again it is rare.
SA 330 Puma "BGS", Revell Nr. 04412
Just keep a look out on evilbay for one.
They also actually did it as an RAF version too, but again rare
SA 330 Puma, Revell Nr. 4499
Thomas used the first to produce this, shame the flags are upside down.
SA 330 Puma, Revell Nr. 4499
Decals and markings, these are not a problem, if you have an inkjet printer you can get decal sheet and print out your own. I actually do some of my own ( though I use an Alps printer which has white ink) which is needed if you are doing anything containing white unless you use white decal sheet and trim it well.
see
Experts-Choice® Decal Film - Bare-Metal Foil Co.
I have the Matchbox Puma so can measure the codes and serial sizes, if you want I could run you off a set that you could print out..... It's not a difficult job to do.
As an example of what I can do, these are my Chinook ones I was working on for the 1/35th Trumpeter kit....