ohh , I am sorry , I forgot to say you.

you should have mac osx tiger or something else to change mkext file and copy.

in this case , you can try another option.

First, you will use transmac.

get any distro iso with RW permission.

delete Extensions.mkext file in this path = /System/Library

than

put you SB700 kext in to this path = /System/Library/Extensions

than burn the DVD.

when you boot the DVD , use -f -v option to force loading the kexts in Extensions Folder.

and please send us your screenshots if it gives error.

you will do 2 DVD firstly.

you can try leo4all v4.1 or for nicholas kext you can try kalyway.

sorry for misinformation , I forgot that.