This mod is really awesome!
So far, we can build big ships, but Cuchaz plans to add submarines, and airships. And the mod author just added an API for other mods to define blocks properties.
So, it would be cool to add a compatibility between the mods in order to be able to make a factory cross the oceans.
So far, I would just suggest adding the weight to the API, and nothing else, but as soon as another API is released in order to make blocks work, it would be really cool.