I found out there was a fourth volume of Yoshihiko Umakoshi's Heartcatch doujins (he was the official character designer) and it arrived today.
I have to say, it's my favorite one of the lot. It has some great scenes from The Eclipse (Berserk), Ban (yay!) from Heartcatch, a lot of scenes from Heartcatch's final battle/ending, including The Giant Freaking Fist of Justice!, some Heartcatch/Doremi crossover pictures, and more Casshern.
The lettering on the cover was shiny again... I'm not sure why my vol. 3 isn't.
I figured that I'd be nice and take pics of it now instead of leaving you guys waiting.
Don't criticize the quality of the pics; I don't have a scanner or a real camera, and if you
really want higher quality versions, you can still order the books.
Those were all from volume 4. I'll post something from 1-3 eventually.