Some of the folks over on macintoshgarden.org suggested that, but it had worked fine with the Leopard install the machine came with.

I did figure this out, though: I was using too early a version of the install disk, and rather than tell me this computer was too new, it simply kept on trucking until it crashed mysteriously. Burned me a 10.4.6 DVD and everything worked just fine.
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Power Mac G4 (OS9/OSX.4, 200GB HD, 2GB RAM, PPC 7455 @ 2x1.25GHz)
Amiga 1200 (KS3.1/ClassicWB3.1, 4GB HD, 34MB RAM, 68030 @ 40MHz)
Sony HB-F1XD MSX2 (64KB RAM, 128KB VRAM, 720KB FD)