i'll replace that model wit a few more lower poly count models, on a more positive sidenote i've got grass (not the smoking kind)
check out the grassy meadow screenshot on nexus here's the link:
http://grimrock.nexusmods.com/Images/62
also heres the lightsource i'm using (wich is pretty stable for exterior skybox:
defineObject{
name = "sx_ceiling_lamp_outside",
class = "LightSource",
lightPosition = vec(0, 6, 0),
lightRange = 25,
lightColor = vec(1.3, 1.2, 1),
brightness = 9,
castShadow = true,
flicker = false,
placement = "floor",
editorIcon = 88,
}