I would repeat what @ironnerd said... go for it if you want to, but don't fly higher than you're willing to fall.
We've learned a LOT about aerodynamics and structures since 1912. If you really want to fly, look at modern "airchair" gliders like Mike Sandlin's Basic Ultralight Gliders, which are FAR more capable and safe, and probably won't cost much more (maybe even less) than the materials specified in that 1912 book. In particular, wood of sufficient quality for aircraft structures is a lot scarcer and more expensive than it was back then.
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