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Who designed the PowerBook G4?
Apple's industrial design for the last several years has been performed entirely in-house by Apple's Industrial Design Group, led by Jonathan Ive.
Yes. The cases used by early PowerBook G4 models -- designated by "Ti" after the name -- are made of 99.5% pure grade CP1 (commercially-pure) Titanium with a ridgid carbon fiber frame.
In promotional materials, Apple said that "titanium's superior tensile strength and low density give it the greatest strength-to-weight ratio of any of today's structural materials. . . [which] enabled us to build the thinnest and lightest full-featured portable supercomputer on the planet -- without having to make the kinds of tradeoffs that would compromise its performance."
However, cases used by PowerBook G4 models starting on January 7, 2003 -- designated by "Al" after the name -- use less expensive aluminium rather than titanium.
Sort of. Apple stated that the PowerBook G4/867 12" (Al) was its "smallest notebook ever", which as some have noted, is true if one measures the volume of the notebook, but compared to the long-discontinued PowerBook Duo 210, the 12" PowerBook G4 is thinner (by 0.22 inches), but it is slightly deeper (by 0.1 inch) and heavier (by 0.4 pounds).
All 12-Inch PowerBook G4 systems use the same case.
There are any number of places to purchase a used Mac. Site sponsor PowerMax offers a large selection of refurbished and used systems, including 12-Inch, 15-Inch, and 17-Inch PowerBook G4 models free of sales tax.
Site sponsor Operator Headgap Systems also sells a variety of upgrades and accessories for the PowerBook G4, including batteries, wireless upgrades, and more. In addition, OHS sells refurbished and upgraded desktop Macs capable of running MacOS 9 and MacOS X applications.