Structurally, I think everything is done. I try to find things to add, or
even modify, however find that quite often more is definitely not better.
Details on the other hand, there can never be enough of those, so I will be
looking into further detailing, including figures, wildlife, foliage, etc.
Vehicles and rolling stock also still need to be added. I have done a little
experimenting with weathering trains, though I will unquestionably need more
practice at this point before I start on anything worth any significant
value. Acquiring HO scale vehicles also seems to still be quite
difficult.