No 3?

We cruise/race/weekend our First 31.7 with a furling genoa (145%). I want to buy a furling No 3 for the windy months (not up & down/on & off all the time). Without going to the boat (long way) how do I ensure that the sail will set inside the shrouds/stays when talking to the sailmaker? Is it worth going for the small vertical leach battens - the sail will be made in a cruising laminate.

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Thanks - guess where the IRC certificate is:-) although that was done without the furling system, I normally plod round with the PYS fleet.

Most sailmakers will have dimensions for most boats so just telling them what you are after should be okay. Unless you have anything differnet on the boat, such as taller mast or possible differnet hoist height for the halyard. The height of thefurling drum off the deck would also afect the luff length. But again depending on which sailmaker you chose then they would normally go and measure the boat themselves (location dependant).
The vertical leech battens are worth while as they prevent the leech of the sail from fluttering too much which helps prolong the life of the sail. Without battens the profile of the leech would be very concave.
Hope this helps.