Thanks a lot to all for your comments.
Clanky, I've seen bilge keels much more proeminents and shorter (longidudinal wise) in other exploration yacht project than the ones above. However, you've pointed out a very valid observation and I was questioning them myself. So I've finally decided to make them less wide and longer. Thank you for the constructive observation then.
VirtualSkypper, I use Rhinoceros 3D for modeling (the above basic renderings are from Rhino) and then Gmax (a 3dsmax lite) for texturing and mapping.
Here's the most recent update with some basic renderings from Rhinoceros 3D, still without textures.
The texturing, mapping and bump-mapping job will begin very soon.
(Please note again the Bell Ranger helicopter is not mine and won't be included in the final package, but just here for representation purpose in these renderings. The small platform will be usable with the default Jet ranger in the other sim).
The inflatable will be separately sailable as well. Bump-mapping has been implemented for reproducing water droplets, chambers, rubbers look, metal and aluminium sufaces, with a touch of wood.
And here's a small rough video of it in operation:
http://www.youtube.com/watch?v=aKA-dG1YXFo
(Select 480p for better quality).
Best regards,
DVOMarineDesign (Dom).