Excellent work. If I may make a few constructive suggestions:
- The grandstand roofs wouldn't be flat - they'd collect rain and snow if they were. Instead, there would be some sort of slant to the roofs.
- You have a modern catcher's box - that wasn't introduced until 1955. In 1896, there was a catcher's area that was marked by extending the baselines to the grandstand. In other words, it was a big triangle. You can see that in this photo of the West Side Grounds in Chicago:
- Likewise, many parks had players' and coaches' lines. The players' lines were 50' from and parallel to the baselines, and they'd then be connected to the coaches' lines, which started 75' from the catchers' lines and were 15' from the baselines. You can get a sense of what those looked like in this picture:
- I can't tell from the pics that you posted, but if you have a five-sided home plate you need to replace that with a four-sided base. The five-sided plate wasn't introduced until 1900.