WWI German Tank references - please help

I'm in the process of scratchbuilding an LK-II (since I can't justify the cost of the resin kit) and I've reached an area I'm not sure about - between the tracks and the main hull. The only reference I have is in the book "German Tanks In World War I: A7V . . . ". I've read there's a good reference in another magazine (not FineScale) on this tank. Are there any other good references out there that would help me in 1/35. e.g. - anyone have the aritcle I hinted to or instructions for the Cromwell resin kit. I'd really like to do some other WWI German tanks as well, such as the LK-I, LK-II Kanonenversion, K-Wagen, A7V-U.