Darn, if only i had experience in thoose fields i would be happy to participate. Unfortunatly i dont. Although can i put forward the question that possibly as a later expansion you have a learning to mod section. Where by you can take us through the basics of modding/scripting for your game engine (As you said it would be high level of modable content).
aslong as i have the basics i can pretty much learn to do the rest. Just a thought however. MAnoMan do i wish i taught myself scripting etc earlier