Really nice work.
I noticed that there are some very functional java decompilers available, such as
this guy. It's true that the Amazon's binaries are obfuscated, but there are still some informative strings remaining in there. I'll be looking into recompiling the original java binaries, which, if possible, would open the door to modifying the original Kindle software. Though I haven't explored the low-level workings on this yet, one idea that comes to mind is removing the need for signing kindlets - the Home app could instead detect and load jar files directly. Just a thought.