I really like your ball field. Wish I had the space.
When you do get the space, it's a piece of cake to make the baseball field. It is literally child's play: about 20 years ago my 10 year old daughter and 8 year old son back then did much of the work! Gluing Popsicle sticks with Elmer's glue to make the bleachers and painting them blue with acrylic paint; using spray glue and sprinkling on Woodland's Scenics green turf; also sprinkling on light brown scenic material for the base paths; and painting many of the figures sitting in the bleachers. I made the fence because I used a cutting tool (a large scissor-like tool for cutting chicken wire or material like it); such a tool would not be appropriate for a young child to use. I got the fencing material from Home Depot. The black fence in the outfield is cardboard painted with black acrylic paint.
This baseball field required very little modeling skill. It's more the product of cleverness and I got very good metal O Scale baseball figures from the Choo Choo Barn in the mid 1990s.
The most clever thing are the monuments in center field, also made with Popdicle sticks; the faces of Miller Huggins, Babe Ruth and Lou Gehrig I got from the Internet and glued them onto the Popsicle sticks.
If I can make this baseball field with my little kids, anybody can do it.