Finally, someone who is playing Muradin the way I do. Delta2Alpha, this is very good beggining for your guide. I am looking forward to see how you update it and provide more interesting information about skill usage.

I am playing Muradin very similar way you do with just few exceptions which are:

lvl 4 - Sledgehammer - yesterday I've found that it no longer affects merc camps.... I guess this is a bug becouse the only reason I used that was to increase merc camp speed defeat and also to double stormbold structures (tower + gate) which was truly amazing. Now I pick the same talent u do due to this bug.
lvl 16 - Stoneform (Trait) - that active saves my life over and over if I don t forget to use it in teamfight :D People really have to nuke me twice before I go down ;] Your proposition seems also interesting due to our cc possibilities.

Wish you all best and keep updating guide. I really love Muradin as a hero from W3, however, in my opinion he should get a little buff to his DMG output. Also Dwarf Toss should be changed just a little in our favor.

Ahlen