Considering audio, first of all, you need to check to see which kexts are actually loaded (either kextstat or system preferences).
I had problem with LAN, because R1000 kext was trying to load first, and I was perplexed why installing proper Realtek8169 kext had no effect. When I realized that I need to remove R1000, my LAN started to work as expected.
I cannot help you about bootloaders, as I got Chameleon working at first try, using Hazard's distro.
And about the x3100, are you sure you need patched kexts? Should't x3100 just work with plain kexts? There are discussions and various solutions at insanelymac forum about x3100, maybe check there...

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Fujitsu Siemens Amilo Pi 3525 (Snow Leo 10.6.2 Hazard distro)
C2D T5800 @ 2GHz; Chipset: Intel G45 Cantiga; 3GB DDR2; Kingston 64GB SSD
Realtek 8169 (from Realtek's site); Intel WiFi 5100 AGN not woking; ALC 662
VGA: x4500 working with dual display (DVI2VGA dongle + VGA cable for Samsung 223BW) with proper resolutions, no QE/CI