Originally Posted by Doitsu
That's not a good idea for a publisher, because Amazon has been known to occasionally reject .mobi files generated by Calibre.
Yes. I've got an unhealthy and irrational aversion to Calibre for some reason, so not a problem.
I managed to get from 58mb to 9mb by making some changes to the toolchain that puts everything together for Kindlegen.
So, all's well that ends well.