As I wrote (I think) last week I finally got Steel Hoof helmet. It took a lot of work to convert a real tanker helmet to a fursuit head. It had to not only fit and detach properly, but also not interfere with taking off/on the head itself. Taking it off every time when you take off the head is a real hassle.
But, I did it! You can put the helmet on (both by regulation and unbuckled), you can take the helmet off, you can take the head off without taking the helmet off and other perversions of fursuiters :)