A: Absolutely. While the battery technology mentioned (SLA vs. Lithium) is dated, the welding, frame geometry, and mechanical linkage principles are eternal. You can simply replace the lead-acid batteries with LiFePO4.
The Genius Trick: Instead of building a frame from scratch, you cut a standard cruiser frame at the seat tube and down tube, insert custom-length tubing, and weld in a gusset. The PDF provides a full-size angle template to calculate your new rake (typically 35-40 degrees for stable cruising).
For enthusiasts of innovative and daring projects, "Bike- Scooter- and Chopper Projects for the Evil Genius.pdf" is a treasure trove of exciting and challenging ideas. This comprehensive guidebook is designed for individuals who relish the opportunity to push the boundaries of creativity and technical expertise. Within its pages, readers will discover a wide range of projects that cater to various skill levels, from novice to expert.