I would drop Altar's Reap for ponder. And i would replace the Diregraf Captains with Blood Artist. Blood Artist and Mortarpod is too good. This is similar to the mono black deck that I play at FNM. http://www.mtgvault.com/ViewDeck.aspx?DeckID=345255
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I would drop a Highborn Ghoul for another Geralf's Messenger. And Phantasmal Image is better than Evil Twin, once again, to copy more Geralf's Messengers, that card is just too good. The popular combo with it is Mortarpod, but Altars Reap and Bone Splinters can do the job. Looping in the loss of life from Geralf's Messenger is a great way to beat any deck, especially when you have a Blood Artist or two in play. Just a few suggestions, I play a mono black zombie deck at FNM. Check out my deck(s)?
I would suggest Hellrider, because he's just awesome in standard, especially with Strangelroot Geist. I also wouldn't have two Thrun's in the main deck, he is legendary after all. I do like the Champion of Lambholt, I've been debating on using her myself. Good deck overall! I'm making a RG Beats deck for M13 also! Very similar except I've focused more on burn, Aaaaannnddd due to card availability, I don't have Bonfire of the Damned. Check mine out? http://www.mtgvault.com/ViewDeck.aspx?DeckID=355834 I plan to add a Thragtusk and possibly a few Rancors, depending.
Ever considered Heedles One? Nice deck, i have a similar one, check it out and see what you think? http://www.mtgvault.com/ViewDeck.aspx?DeckID=349796
The thatcher revolt with battle cry is pretty clever. Hellrider would be the icing on this cake.