I started doing some mockups of the River Valley town module. It's going to be very minimal if I can help it, a couple buildings or a couple houses at most. Just enough to convey that there's a town. I can't decide if they highway should be "Main Street" or if the highway should be perpendicular to it.
The real meat of the town will be the co-op and scrap yard built on a quad module and irregularly shaped S module. Placement of things here is more straightforward, obviously the elevator and fertilizer shed go on the elevator spur, and the scrap yard office somewhere on it's spur.