I like it. Not my style of Hdin, but it's not a bad guide. Just a note that your Hdin won't hit the 75 FCR BP if you use Phoenix and Bloodfists. He will only have 60 (Hoto + Arach) I personally don't like Phoenix, IMO it's worth the extra skill point to get the FCR and Resists and FHR and mana xD (then again, I use a 125 FCR build so...)
I don't doubt that it's effective, but I personally wouldn't use it.
About your Merc, I don't know when you posted your original guide, but I have seen that before this one was written. You could be th originator of that in the first post, just pointin that out
Happy New Years