Michael,
I get a lot of credit for my junk rigs by local sailors. When I, on request, tell them that I made the sail in my living room, their yaws drop.
Little do they know how simple it is (when I use my Amateur method B). Maybe you have had a glance on TV programs where amateurs compete in haute couture. Their skills are amazing and can kill the courage of any beginners to sewing. I promise you; the skills you need with a needle or sewing machine is less than 10% of what these hobby tailors show.
As soon as someone has taught you the basics, which is to feed the thread correctly, filling and installing the under-thread spools ( spool up 3-4 at a time to save time), and balancing the tension between the under- and over-thread, you can set to work. Make a couple of sail bags or whatever first and experiment a little with stitch length and zigzag width, and before you know it, you are in business. Surely, it takes a bit practice to get the seams straight and even since the weight of the cloth will want to pull you off the course, but a un-even seam is just about as strong as an even one. Besides, and never forget this; the loads in the sailcloth and along the battens of a cambered panel junk sail is only a small fraction of the load in a gaff sail of similar shape and size.
Actually, I find the lofting of each panel to be more work than the sewing part. However, since I now use the practice of lofting each panel on painter’s paper, I can do any errors there, and spot them well before I start cutting in canvas. Also, remember that you only need floor space enough to loft one batten panel at the time.
If you look up how I have done it, either shown on “my” page, here or by going through the album, showing how Ingeborg’s sail was made, you will find that there are no extraordinary skills needed and no metal grommets in use anywhere. Btw, here is Ingeborg's sailplan.
Take a good look and see for yourself.
Arne
PS: If you need a bit help on the design part, just let me know, and I’ll give you a hand.