I finished my letter a while back. It's the one on utilizing team preview in GBU. I don't really know of it can/need a QC check. GBU doesn't really have an organized presence in quality control. Though it is upon for some GP checks.
Anyways I want to continue my series in writing GBU letters. My next topic is "Transitioning from Smogon to GBU battling". It will explain all the differences between the battling kn smogon and GBU. Is this idea enough to warrant a letter?