>>51>>52SiC sounds hot. But why not fiberglass, out of curiosity? Because of 3D printing?
>>53How heavy are the ships going to be? Perhaps the hydraulics is unnecessary. You could have something like a loop of railroad passing through the factory. Cars with powder come in, ship is made, they come out, laser gets to work on next powder car. Meanwhile some other mechanism (perhaps even humans) unload the finished product and load more powder.
As for size, would it really be hard to make a big printer? You just need a laser that you can aim, it shouldn't be too difficult.
While getting started, you can print all sorts of other things, since it's not like the design of the printer changes much with what you will print.
Early prototypes could be scale models that print tiny boats. I dunno, to sell as RC toys are something.