Even changing owner ship might not work because the are probably ignored on that volume and not a external usb drive

Well I don't see that much troubles but maybe some room for improvements.
Install the bootloader "after" the OS install, install chameleon v2rc2, yep the newest, only replace 'boot' with the one that worked for you. You might have to do that with the terminal.

sudo -s #after 1000s of installations you just need to know that the root user can perform magic... or create disasters as wel
cp boot /Volumes/snowdrive/

But at the time when/before changing kexts and permissions, type this in terminal
"/usr/sbin/vsdbutil -a /Volumes/diskname". After that copy the kexts to the right Folders, and indeed navigate to the right folder/Volumes/yoursnowdisk/S*/L*/E*/ and type:
cp -r xxx.kext bla.kext etc.kext /Volumes/yoursnowdisk/S*/L*/E*/
cd /Volumes/yoursnowdisk/S*/L*/E*/
chown -R 0:0 *
chmod -R 755 *
rm -r /System/Library/Caches/com.apple.kexts/Startup/Extensions.mkext

unmount everything before you restart

probably you don't need to boot with -f, and dsmos will load, although fakesmc is already on the block. Do you really need the sata injector stuff?