I've had the editor's first run through back in my (digital) hands for a couple days now and have been sifting through it. So far, so good. She made me realize something that I had forgotten to mention to her and to probably everyone outside the voices in my head.
For those of you unaware, America is one of a few countries NOT using the metric system. To me this is a pretty stupid move. The scientific community here, as well as the hospitals are on metric, but for the most part we are using US Standard (feet/inches).
What I had planned on doing with the main series was slowly converting over to metric as time passes within the series. The Five Man Midget Death Squad book is written about 200 years into the future, where I suspect the entire world will be far more unified in, among other things, measurement.
A last thought, and one I know I've stressed a couple times in the past, is the layout of this book. It's written 200 years in the future. Written as a brief historical piece on the Tungri Clan, a dwarven city-nation who currently lives in the Scottish mountains somewhere. 1/2 of the book is about how they ended up in Scotland and the events that shaped their lives and the other 1/2 is about the Death Squad, a five dwarf team who ended up shaping the entire world. It is tied into the main CoM series, but much like Hitori it is a standalone book. No background information required.