@Extreme: You have forgotten the sharp rocks at the bottom of the waterfall .
@Snow Monk: Currently I have no time etc. to continue this project, but the idea with different modules could be helpful (however I have to figure out if this is even workable on such a scale).
Maybe it would be more interesting to build just one section (like the section with the bridge on top of it) of the ship with a inner structure in real life, whereas building some rooms etc. in programs like LDD should help a bit.
PS: In my opinion MLCAD is faster and better than LeoCAD (e.g.: loading time), but it has more difficult controls. It's like "pick your poison": a fast program with difficult controls or a slow program with easier controls .