Ok so I got it installed and nearly everything works.

A few notes for you wiki,

if using only the disk you need to restart after making the raid give an error, then delete and build the raid again and it will succeed and let you install.

A few of your commands in the wiki some little mistakes, you missed the . in ./standalone when adding the bootloader

when doing the mkdir commands, you list has one wrong, I think its the usr one you just forgot one directory when you wrote it down.

Other than that the guide is fine.

A few extra notes.
when changing the boot file it needs to be the one in BOOT directory not RAID Directory.

And when using -f the extentions that load are the ones in the boot partition not the raid partition, so when installing anything with kexts you need to install them in the BOOT drive not the RAID Drive.

I tried just copying the extentions folder into the boot drive after installing my graphics but it didn't work.
only installing the graphics in BOOT worked.

Maybe you have some more ideas on the extentions problem, I always seem to need to use -f for my usb wireless to auto connect.

Thanks heaps for the guide, for anyone else that wants to try it takes a little while but is well worth it.