Looks to me like you got all the basics of TG down really fast and really well.
Since you seem to get lots of energy and pleasure from doing ships you may want to focus on developing surface shaders...
In the major 3D softs, you either get when you buy, or through a 3rd party after, a large collection of material shaders made to work perfect in whatever renderer. So woods, metals, plastics, stones, so on. For example:
http://www.dryzen.com/shLibV002_preview.htmlSadly TG does not have this from anyone. So, if you are going to do lots of rendering with metallic objects....
Even with TG not displacing objects in a "normal way", something like a shader library could be very popular, you could even sell them on NWDA. As for me, I would really like to see stone and wood shaders, but I digress
Anyway, just an idea for you if you need them anyway for your boats, why not think about making and selling them too, at a nice price
In the meantime, J meyer made and gave away a car with some really good metal shaders for TG. You may want to track him down and ask him about it. Looking at his files could really give you a giant jump forward on your surface work for your ships. (your making such fast progress anyway, may as well go warp speed)
Lastly, again just because this seems to be a real pleasure for you, how about trying to get something like this :
https://farm4.staticflickr.com/3354/3328157572_569ac6367e_z.jpg other than the modeling part, should be pretty easy to get the textures in TG.