the Legato- resin full kit is based on the conversion kit made by the polish company "Top Gun" (which also had the Mi-14 CJ built). The Top Gun Conversion only provided fuselage halves and some small parts and you still need an airfix kit.
This conversion kit came up, I guess, with decals for a swedish HKP.9b.
As this conversion set was produced during the 90'ies and the company disappeared, I believe it would be even easier to watch out for a Legato- Kit.