OK, I've got a few more to parcel out here, and then my 1917 Yankees can get on with their Western Spring Training trip!
Here's Pirate Field in Galveston. It had a relatively short lifetime in between hurricanes in the late 1910s, but it did host at least a few Spring Training games between the Athletics and Giants and the local nine. There's no Sanborn map for it and not a lot in terms of photo documentation other than what I've included below, but contemporary newspaper accounts talked about "raising the Jolly Roger" for Opening Day and didn't seem to be kidding, so I included it.
The pleasure pier in the distance is a little bit anachronistic, but not stupendously so. The newspaper accounts were very proud of the "bowl-style double walls" but didn't actually describe them very well, so this is a bit of an educated guess. The parking lot out beyond left field is artistic license, but the claimed dimensions of the field in that direction are much shorter than the lot size, so I figured this was a good compromise...
Google Drive link to Pirate Field
Coming Soon: Rec Park in San Francisco (finished), Ponce de Leon Park in Atlanta (basically finished).