Here's what I've been able to do so far:

1. Wiped out and reformatted the SL partition (IDE disk)
2. From Leopard (SATA partition), ran the DVD installer (not an image, but the actual DVD, which was the only way I could get past the package error) and installed to the SL partition
3. ran myHack on the SL partition, including Chameleon and the chocolate kernel
4. Added a bunch of suggested kexts to /Extra/Ext (including a hacked AppleATA kext, without which my partition would not boot)
5. Created a custom smbios.plist and added it to /Extra, including my SL partition's UID
6. Created a custom dsdt.aml and added it to /Extra
7. Customized com.apple.Boot.plist in /Extra, including an EFI string for my graphics card (GeForce 7600 GT 256 MB)
8. Fixed permissions, etc.

Current results:

• SL partition boots (after about 10 minutes of mostly blue screen)
• Full graphics resolution, but not sure about QE/QI (not listed in hardware profile, where it usually at least says "not supported", here they aren't listed at all)
• No sound (Realtek on-board ALC888), despite AppleHDA and enabler kexts in /Extra
• Leopard partition would no longer boot, due to kernel panic. I solved this by renaming mach_kernel to chocolate_kernel, but that seems like a dangerous hack. I would like to know how to get this partition to use its own boot options instead of those in the SL partition.
• Firewire profile says "unable to list devices"
• System will not restart/shutdown: it goes through the process and displays "safe to shut down" but doesn't do it (this is also a problem in the Leopard partition)

Other than that, I think it looks okay, but I'd like to solve the above problems and be able to somehow test how solid the installation is before trusting it. Any ideas on this?

Thanks.