Glad to hear that it worked for the most part. (I didn't have to use any graphics stuff from 10.5.5 though, so that's weird that you did.)

As for the CPU name, I think it's done on purpose to allow compatibility with apps that do CPUID checking. You can manually fix it in About This Mac, but as far as it's appearance in System Profiler, I think you're SOL as long as you're using Voodoo XNU 9.5.0. I wont get too deep into it (this thread isn't for it, but check out the Voodoo documentation which you can find on the site, it's very helpful).

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Mac OS X Leopard 10.5.8 (9L30) | Chameleon 2.0 RC3 | Intel Pentium 4 3Ghz 800Mhz FSB HyperThread 1MB L2 cache SSE3 1MB L2 cache works, cosmetic display of 512KB L2 cache | Asus P4V8X-MX VIA Chipset, VIA-VT8237 Southbridge | AC97 VIA8237 | Dual 1GB 333Mhz DDR SDRAM | nVidia PNY GeForce 7600GS 512MB 8x AGP DVI/TV-Out/VGA [NVinject 0.2.1; QE/CI/QuartzGL/Rotation] | Darwin Kernel Version 9.7.0: Sun Jun 14 20:48:28 IST 2009; Voodoo 2.0 Intel alpha3 :xnu-1228.12.14/BUILD/obj/RELEASE_I386 i386