I was looking at the skills, I'm not sure how the Melee build would work. I'm assuming it'll be a boost to Grim Scythe and maybe curses? Probably Bone Shield too.
Maybe something like the DMO/Shadow set.
2pc Increases the damage of your Grim Scythe by X%.
4pc Duration of bone shield inceased to X and reduces all damage taken by Y%
6pc Increases damage dealt to enemies effected by your curses by X%.
That probably wouldn't work... But something along those lines would be a decent melee set.
The Pet and Blood sets should be obvious.