We really need Dr Tilley from Finescale and other forums, he is the Golden Age of Sail expert. I worked aboard Mayflower II, a 1957 full scale replica of the ship that brought the English colonists ("pilgrims") to America, and can offer a tiny bit of info:
The Shrouds are the lines that support the masts, the vertical lines. The ratlines are the small, thin, "ladder steps" that are horizontal. Sailors used them as steps ( but never handholds, always grab the heavier shrouds!). They were made off with clove-hitches or similar. Victory was big, but I'm having trouble picturing what she would be in 1:200. If big enough, just do it the old fashioned way - tie very thin thread, and for glue, I'd use PVC white glue (Elemers, Aquadhere, etc.). It dries clear and soaks into string/thread very nicely.
Beeswax (available from craft shops and Mediaval fairs) works well to crush hairs, rub it over the thread/line and it keeps hairs down. Also, some fabric shops sell nice cotton thread that is almost hairless. You just have to examine carefully.
It will be some work, but look great!
I recommend investing in a good ship model book, there are many about square rigers, awesome info.