If you can share the publication year or a few project headings from the PDF, I can give you a more specific assessment of its relevance and accuracy. Would that help?
You might ask: Why specifically the PDF? Why not buy the hardcover?
Cutting, grinding, and basic arc or MIG welding.
A favorite among urban "bicycle insurgents," the tall bike is created by welding one bicycle frame on top of another. It’s a lesson in balance, structural integrity, and how to survive a red light when your feet are six feet off the ground. 4. Motorized Friction-Drive Bikes
To give you a taste, let’s look at one iconic project: