Thanks, all!
My experience with HO helps a lot, but being dang near 70 isn't helping as much as I'd hoped...? More patience, but less visual acuity...
One of my little joys is making detail items out of whatever I have laying around. For instance the cattail leaves are little slices of green insulation off some 18 gauge wire, and the seed heads are dabs of brown "puffy paint" on some magnet wire. Reeds/dead weeds are snipped off the end of a whisk broom. The corrugated portion of a plastic (gasp!) drinking straw makes a great culvert when stretched out and hit with some silver paint.
House, barn and grain bins are kits, all the other structures are scratch built.
Trees are stranded copper wire armatures, a little solder, some brown paint, some spray adhesive and static grass.
Little dabs of red enamel for the apples.