Sources 1

The famous Red Compendium from 1989 has a complete Squat list from the first edition, which is where I started trying to upgrade the Squats to 6th edition. There's a wealth of information here, and if you can scrounge up a copy tons of stuff, mostly arcane from back in the day when the hobby was fun. However I'll save you some time if you're interested in the squats. An excellent 5th edition revision is available online via Rasmus of 40konline.com which is easily tweaked for 6th edition. That guy saved me a ton of work and there's a great deal of background information in there as well. Clearly he loved the Squats as much as I do. It's not tournament legal, and I know that sometimes Squat armies turn up at the Golden Demons playing under IG rules and the GW guys really hate it.