Bevu, I think that, like most concepts here, this could use a little smoothing out, but lets have Riot fine tune that for us.
While melee AP apeals to me, I'm not sure a B.A.Skelly wielding a B.A.Pillar is really Magicky, but I imagine the spells will totally make up for it. (Cool Graphics ftw, right?)
On a side note, how big a skelly are you thinking? Lvl 18 Cho'Gath size? I'm going to assume bigger than some of those midget champions.
Also, +1. Very inventive, and I absolutely love the Trundle interaction.