Most of the information in this Sourcebook was contained in the Field Manual AU: 3028 in its original form. However, as my idea of the universe evolved and the info I wanted to put out on the Clans grew it didn't make sense to have them together as one book.
Additionally I had competing ideas on how I wanted to handle the Clans, wasn't sure if I wanted to kill off more clans than in canon or have all the clans alive circa invasion era - eventually I decided on doing both, due in no small part to the influence of how they did it so well in the Kapteyn universe on these forums and their Clan sourcebook.
I used layout inspirations from Operational Turning Points: Op Revival Trials I believe for backgrounds/text boxes etc. I used banners inspired by a really great artist on the HBS BattleTech forums among other art assets. I tried to flesh out my Clan story without too much retreading for those who have read the canon clan story a million times (but still enough detail I hope). I wasn't the happiest about how I ended this book (with some crudely drawn maps, etc.) and may go back to that in the future.
This split off of FM AU: 3028 around May 2016 and I completed it by October 2016 - the attached PDF has some minor type fixes I did this week for uploading here.