This seems like a good idea But I would appreciate it if you put what version of Minecraft this was for (though I'm guessing 1.6.1) and also a screenshot of how to craft the horse armor from the actual game, instead of just the way you did it. I will be trying this out, and tell you what I think. I am a big supporter of this idea!
Edit; I LOVE THIS MOD! Such an easy instal and it's a simple concept that changes a lot! The world I play 1.6.1 in I've already explored a lot, so none of the dungeons have any horse armor in them. Now, I don't have to worry about spawning in the armor. This is an amazing, easy to use mod that's good for anyone who wants to protect their horse without having to explore too much!