@ Ezgo:
Yup, 2 tracks on the sides. The middle is filled with hatches, doors, storage spaces and Engine Stuff.
@ Eswube:
Good point, I will try fix the vents.
Though, I am going to stick with this shade of grey; it's already very grey on my laptop (it just starts to get a little bit black on low).
It's a good thing you reminded me of those "masts". Yesterday, I discovered their original colour should be white/grey-ish. And when I say "masts" I must confess that I have no idea what they are. I haven't found any picture yet showing a flag on it; and when this ship (or one of her (little) sisters) has a Dutch flag planted on it, it is located on the transom. I think it was used for signalling, but I will have to be more confident about that to put some flags on these "masts".
I will look at the shaft. I traced this drawing over a scaled original drawing of it, but I agree that it doesn't look right yet. I had understood that some artist's impression was allowed on shipbucket, so we will see what it will turn out like.
Thanks for your comments!