Just need a height map 8 bit greyscale or a model that I can render one out from. I can take almost any kind of model but at the mo I don't have a sketchup format converter. I should be ok with 3dsmax, obj, lightwave, vrml + lots more like that.
If your building it yourself then its not worth putting huge amounts of detail in as it seems that the thatch covers it up.
Heres a basic hut. I have loads of huts and this is the best one I have. It took just a few seconds to generate.