Here's another park for your 1910s-1920s use: Tate Field in Richmond, VA. There's not a ton of info out there for it collected in one place, though it does appear in Green Cathedrals and a few other places. I've attached two pictures below, including one during one of its frequent floods. Green Cathedrals notes that it was used for 20 Baltimore Black Sox games in 1928 alone and was used for "various other ECL and NNL teams 1925-1941" and was "[p]ossibly the most frequently used Negro League neutral site parks [sic] in the east."
As you can see from the pictures and park screenshots, it sits on an island in the James River, with a railroad line heading just outside and above the ballpark. I handled the fact it was on an island in a bit of a goofy manner, and the river banks are way way higher than they are in real life. But the park works and is a pleasant enough place to play. Enjoy!
Google Drive link to Tate Field
My next post will sum up what I think I'll be doing next, ballpark-wise, as well as the general thrust I seem to have...