Wing jigs were not hard. They were pretty tedious and took a long time but they were not hard. I started by getting some copies made of the wing templates at a local Office Depot. I then spray-glued them onto some plywood blanks. I used 1/2" OSB, they worked, but there were marginal strength. A lot of folks are recommending 5/8" or thicker masonite or similar.
Centerlines were marked on the board blanks and I used the factory edges as much as I could.
The bandsaw was used to cut out the holes. Nothing special here, use a fresh blade, go slow and expect to have to do some sanding to touch up 'cause some of those inside corners are really hard to get to, depending on the size of the jig and what corner of it you are working on.
Here's all the jigs after being assembled with the blocks that will hold them together. I have to admit - some of these plans steps are, with all due respect, a little crude. You make plywood jigs from paper templates then cut them into four pieces. I don't care how carefully you do this, I guarantee the jigs are not the same size or shape after all this happens......
One thing that was interesting to note was washout (reduction in airfoil section angle of as you move out toward the tip of the wing from the root.) If you stacked all the jigs on top of one another, you can see the washout plain as day.