Are there any suitable plastic models that resemble the Mahud? All I've seen so far are wargames factory zulus and I'm not the biggest fan of their sculpts.

Some of the Gripping Beast models could be converted.

http://www.grippingbeast.com/shop.php?CatID=14

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"Naur an edraith ammen!", no thanks, we have central heating.

There's also Perry Sudanese Tribesmen:
http://www.perry-miniatures.com/product_info.php?cPath=22_62&products_id=2593

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Better, though difficult, the right way to go, than wrong, though easy, where the end is woe. John Bunyan - Pilgrim's Progress

I agee the Perry bros figures are good, they did make camels once.

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Harfoots-The first of the Hobbit people to cross over the Misty Mountains and enter Eriador.

I'd second the Perry Sudanese tribesmen, or if not them the Warlord Married Zulus. I'd generally lean towards the Perry figures for LotR Mahud substitutes, but the Zulus do have the distinctive wicker/hide shield.

I would think it would also be relatively easy to convert either set to be wearing the large wicker collar that the GW mahud wear.

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Well, that's my 2 cents.