how you get it into a single subobject does not realy matter, the importent thing is that it is one subobject (not counting turrets and such naturaly), though I usualy tell people to make it OUT of one subobject, as in no bouliens no tricks just placeing a cube (or a spline object) and makeing it into a ship, and makeing it out of triangles, becase after about two months of that they will have great geometry skills, and will be able to make extreemly complicated geometry with bouliens and tricks, and be able to manipulate the geometry on the verticy level and precisely and perfictly, I guess this doesn't realy matter if your just doing this for fun, but if your tring to impress people (like game companys) it's best to learn to do it right.
(by that I don't mean the learning proces wich is why I am always harping on people, I mean final products to look as good as [v]'s)
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Bobboau, bringing you products that work.............. in theory