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Fit to page puts your "page" within the magins of the printed page, ie sized down. There's also the old A4 or US Letter page size question that could affect the outcome.

My photoshop sizing is spot on. I would recommend that you check your print settings. There are a few options you should make sure you don't use like "Fit to page"

Great to see pictures!
Whish I could have been there. At least I have just switched assignment at the job, so now I'm hoping for free time and no more working weekends. Time for more sails.

Can...

Yes, but you don't need to get one as HMS Bellona is the same model. If you want to make a repaint why choose the rare expensive version of the same model as for example HMS Superb and HMS Goliath?

The Belleraphon is the same model as all British 74, Elizabeth-class etc.

That combined with the faulty scale on the Sails ships makes the 1:1200 too big for the 1:1000 ships.
It's a pity since Langton's stern galleries are gorgeous and better than the standard Sails...

Interesting fact: Langton's Spanish stern gallery to first rates are too big for the Sails ships.

Santissima should be much shorter than Ocean.

Theoretically you should be able to add another deck on any Meregildos.