It's a pity that this is so difficult to try. The blog post has so much detail and effort put into it, but all that shine and polish disappears when you try to install it.
Specifically Step 1 of the instructions has a link titled "install node and npm"  which has the line 'git clone git://github.com/ry/node.git', which is incorrect. The correct URL (as far as I can tell) would be 'git://github.com/joyent/node.git'.
In addition the linked instructions say nothing of npm, which can be installed quite easily by running 'curl http://npmjs.org/install.sh | sh' as root.
Back to the TermKit instructions again, and step 5 says 'git clone email@example.com:unconed/TermKit.git --recursive', which didn't work for me. What worked was 'git clone git://github.com/unconed/TermKit.git --recursive'.
Finally after all that, I just see 'You cannot use this version of the application TermKit.app with this version of Mac OS X.'. Would have been nice to mention that at the start.
I get that it's not meant to be release quality yet, it's just a shame that your blog post was so comprehensive and detailed and fell down on that last point. Certainly spending half an hour installing software only to find out I need to upgrade my OS X wasn't fun :(