Hmm. I never looked at extensions to see if it was loaded and I've not tried doing what you did. I was always manually loading the kext after boot from the Terminal (so I didn't have to reboot to try new versions). Given that I'd call this "pre-alpha" at best, you may want to hold off, but if you're brave enough to continue...
1) Make sure you were root when you extracted the files. All files in the directory must be owned by user "root" and group "wheel" or the driver won't load. To ensure that the files are owned correctly, from Terminal do "chown -R root:wheel /path/to/IOSDHCIBlockDevice.kext"
2) Run "sudo kextload -tv /path/to/IOSDHCIBlockDevice.kext" from Terminal.
3) The output from that *should* tell you what's wrong.
Alternately, it may start working at that point. I suspect your problem was #1, but I'm not really sure what Type11's script does.
EDIT: Also, in a different terminal window, run "sudo tail -f /var/log/system.log". If the driver finds the card, it will output some junk in there (part of which is the size of the card). Between the output of that and kextload either you'll figure out what's wrong, or I can.