Cool. Right, well, It is easiest to copy and paste things when making the model. For example, in the picture is shows part of the keel. Highlighted in green is the paste box. press this, then select the whole of the thing you want to paste. When it comes up, fit it to the other part. Make sure that the parts will fit. Look at the diagram for a good idea of this. This makes the process much quicker, and you can assemble the ship faster: