Hi Dermo ,
I'm not sure if my post is going to be of much help , other than showing you what's in my stash and my general opinion on each kit.
Personaly I think the Fujimi and Revell Seaking kits are a lot better than Airfix's offering .
I do have an Airfix Seaking in the works right now , however I replaced the kit main rotor blades and hub with one's from a old Revell kit . [It's the only reason I've decided to continue building the Airfix Seaking.
Back in 2008 , I used two Revell Seaking kits to improve a couple of Lindberg HH-3E Helicopters , by using the front cockpit section from Revell's kit and fitted it to Lindberg's fuselage .
This work out quite well , I know there not Seaking Helicopter's but Revell's front cockpit certainly improved the Lindberg kit . [I also used Revell's main rotors and rotor housing]
I have also built the Lindberg SH-3A Seaking but like it's sister kit [HH-3E] , It's quite basic .
The Fujimi kits I have in my stash have two different sized sponsons included as well a short and longer horizontal tail plane , [ SH-3D or SH-3H version ]. Plus an auxillary fuel tank .
The Revell kit's have a good fuselage interior so does Fujimi's , but I think Revell's is just slightly better.
Two of my Fujimi Westland Seaking kit's I intend building as U.S VIP Helo's as most of the port side windows are blanked of , so I can cut open the one's I require for the U.S version . The Revell kit's already have the windows cut open on their fuselage pieces and those window opening don't suit the U.S version . [ I wish they would have left them blank , it would mean you could build a lot more different versions ???. ]
Anyway , like I said at the begining , it's only my opinion about certain kits . I'm sure other modeler's would give lot's of other thoughts and opinions .
I hope this helps a little .
Kind regards John .
BTW , The Airfix Seaking that RedCorvette built is absolutly awesome , I would have never thought an ordinary kit could turn out so well . I also like the rotor fold and tail fold as well .
That's one beautifull Seaking , well done RedCorvette