You can check out the font hack sources for a working kindlet. If you don't need the Kindlet Jailbreak stuff, you can just ignore it (you probably don't need it for simple Kindlets; you probably will need it for more "complex" stuff, such as accessing files etc.)
The fonthack sources also include a build.xml that takes care of the signing etc. You're probably better off by using one of the existing dev keys (dktest etc.), because there are packages to install a set of known dev keys on Kindles.
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