The Aero MkII 2536 "Catalina" is an updated sci-fi concept for a flying boat. It is more streamlined and has some modified features.
It is a spacecraft3 vessel and as such requires the spacecraft3 addon.
catalina+0.1.zip contains:
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mesh with improved topology (basic visual comparison)
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initialsiation file with various features: new docking configuration, modified animations, added attachment point
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two scenarios: catalina at Gran Canarias and catalina at ISS
It does not use textures, but go ahead and add your own if you want. Installation should replace the old catalina.zip files (which is presumably a good thing).
For more details see readme.txt in the linked catalina+0.1.zip file.