Someday there'll be a 1/48 HH-3, but until then we'll have to settle for 1/72. Years ago I saw a 1/48 Pelican model in a magazine showing a contest in the UK, but it was a scratchbuilt (or at least HEAVILY converted H-3 Sea King).
I just finished putting the Hawkeye Models (from Australia) USCG HH-3F Pelican resin conversion kit on the ole Lindberg H-3 Jolly Green kit. The Lindberg kit is rough: lots of huge "rivets" and no real worthwhile detail inside. Fuselage fit is pretty poor, requiring a lot of sanding and filling around the canopy. There is no hoist (but you get a resin one with the conversion kit) or any antennae. You also have to fill the gaping holes in the right side of the cockpit where the refueling boom was to attach.
I was wanting to do a fun and easy build, so I just painted the windows black and will make it a desktop display model. A base coat of white is drying as I type this. It won't be competition worthy, but at least it will be a Pelican.