That will never happen, especially if your not ready to pay thousands of dollers for it... But i guess it could be possible to make some sort of ship module assembly thingy... Like we have already, but way more complex.
Seperating inside and outside. Life suported modules (thinking something like ISS) (It doesnt matter its just an example) in different sizes and shapes, adding all other stuff Engines, guns, shields and bla bla and fit a protecting hull over it. The Hull could possibly be extended in hight or width in some places... Anyway this is getting longer than i wanted it to.
Seperating inside and outside. Life suported modules (thinking something like ISS) (It doesnt matter its just an example) in different sizes and shapes, adding all other stuff Engines, guns, shields and bla bla and fit a protecting hull over it. The Hull could possibly be extended in hight or width in some places... Anyway this is getting longer than i wanted it to.