ixtab, I did this:
installed kindlet-jailbreak (I already had the ordinary jailbreak)
Then I took a font (Times Roman) which I use on the K3 and changed the names to the required convention, put them in a directory called Times Roman and put the dir in the fonthack directory on the Kindle. Then I restarted.
According to your readme I should see 00-Times Roman.conf and possibly 99-serif.conf. They're not there. All I have in the fonthack dir is de dir I put in (Times Roman) and the readme.
And I still have the regular Kindle font and can't think of a way to change it. What am I doing wrong?