I was looking for some resources to tune the rig, and my first thought was to check the Port Townsend Rigging website for resources.
Found a free rig tuning handout by Selden mast here: http://www.porttownsendrigging.com/resources/reading/
And they mention this book, "Sail & Rig Tuning" by Ivar Dedekam for the DIY'er :
James Bibb already owns a copy & would be willing to share. I'll be ordering a copy for my own library.