I just made the leap and ordered the Odyssey III, webbing and thread for the planned new rig. There's a blizzard howling outside with the spruces just bent right over but the wood stove's keeping it warm as is my anticipation of some quality junk rig sailing ahead. One of Arnes's 10 master sail plans, A.R. 2.10 and his chapter four took out the guess work and made it straight forward to scale the dimensions to my needs. Thanks Arne!
I'd planned to convert a Compac 16, made the sail and bought batten and mast tubing. I originally chose the 16 as a smaller boat often means less preparation and maintenance and more sailing. While it's a a lot of boat for it's size it turned out to be a bit small outside and in for a couple who are getting a little less spry. I found myself sailing solo more than I wanted. When my better half suggested I look at a Compac 19 it didn't take saying it twice. The boat was sound and the price right. We sailed the CP 19 as rigged last summer and now I'm off again this time with some basics on the sewing machine, batten tubing large enough for the new rig and a piece of mast tubing that will be the center sleeve for the new hybrid mast.
It's been about twenty years since I took a wing shaped, high aspect, battened flat sail and had a local canvas worker cut it down to the PJR shape and used that book as a guide to help convert an O'day 23. I got sold on the ease of the rig despite the lack of camber. I sold that boat, sometimes regretfully, long ago. Today I'm really looking forward to getting back under junk sail.
P.S. Rochford Supply in the US has prices for Odyssey III for under 8 dollars per yd, (36 x 64 inches) almost half the cost of many other supliers.