everything can be modified to make things look a lot nicer..

the preformed wooden decks for the superstructure fit nearly 99%... there i did not modify anything...
only thing to think about with the superstructure, is the plastic deck needs to be glued in place a fraction lower than the marked line on the superstructure side panels to allow for the wooden deck.
the Main Decks planking is not quite as accurate, i suppose they could be used as supplied, but they did not quite cover all the plastic deck as i would have expected, it might be the way i built my Hull, i might have not keep with in the measurements.
basically i bought some more 2 mm
single planks, about 6 lengths in total.
fitted the preformed decks loosely, marked the planks to be removed, because i would like to lengthen them to suite my wishes of how the deck should look, glued the preformed deck in place, then added the singles planks to fill in the gaps.
i hope the attached photo explains a little better
all in all, took me the best part of a sunday to do the complete Main Deck.