marriedshades,
Would it be possible to get a clearer picture with measurements? That being said, it does look basic as you said and that is by no means a criticism what so ever. Keep it simple a very good way to get up and going with as few problems as possible.
My only query is the spurs that you have, I don't really see any use for them as they are. My only other thought, and this is completely due to the room you seem to have, why not consider double tracking the main line then working out from there with sidings and spurs for industry and so forth, if that is what you are going to have at some time?