Here are a few questions which we get asked a lot, hopefully this information will help you out too.
ISAF hold these plans, you need to speak to them about getting a copy www.sailing.org
It’s 644 for a Sport boat.
The wire should be 6.7m in length which takes you from the mast down to the block which allows you to adjust your height. From there the adjusting rope is usually around 1.5m but this is down to personal preference.