Oh yes, thank you! Of course I meant large scale equals more details and vice versa. Sorry for messing it up. To begin with, I put the idea of printing it aside - so I can concentrate completely on the screendesign.

Step one was cropping the original .SVG-map focussing the landmass I want to draw. Then, to get it into 55px : 20km I had to scale it by 4081,63% (I still do not have a clue why exactly that number but that sounded reasonable when I compared another country map to the original world map, and there the scale of 55px : 20km turned out nice). Below you can see a cropped detail from my map which has now the size of 10,900px x 4,400px (W x H).


(please click for image in original size)

What do you recommend me to do next: To draw the coastlines in a more detailed way in Illustrator as they should look like at the very end or to let them be so rough so FT3 can make the finishing touch out of that template? I do not know how accurately you can paint in FT3 and align to the reference.

Thank you again for your advise!