If you're not doing this to a. learn about sailmaking; or b. indulge in masochism;

Just go have the sails made.

(I have a Sailrite LSZ and a Pfaff as well, and I do canvas work and sail repair, for what that's worth. I have my sails built at a loft.)

Sailmaking is WAY hard unless you're equipped for it (and even if you are equipped for it.)

As in, having a nice big loft floor to make the layout and sewing itself easier... having a triple-zag machine (which Sailrite LSZ isn't)...a grommet press...handy-billy to stretch the luff rope...

mainly that nice loft floor to pin your sail out and to keep the sail under control as you're sewing.

For the hassle involved, it's well worth it to pay the sailmaker. please believe me. (If you just want to learn, go offer your time to the sailmaker - he needs cheap help, 'cause he ain't making much money.)