Handlan's Park, St. Louis
By request here's
Handlan's Park, home ballpark of the Federal League's St. Louis Terriers:
Google Drive Link for Handlan's Park
While its use by the Federal League didn't last very long, this ballpark did have a bit of an extended life--after the Terriers were done with it, it apparently was used by some of the better soccer teams in the USA during its first wave of popularity in the 1920s. At that point it was called "High School Field", which is not an easy thing to do a search on.
In any case, there are some maps (both contemporary and by researchers), and two photos (one tiny, the other of a soccer game). I actually tried going the skybox route with this one, though I'm not sure if it's really better than going no skybox and YMMV. I used the park factors from the Gambo spreadsheet rather than calculating them from the park itself, though I did include the dimensions of the park (which differ from the ones in Green Cathedrals by a little bit). I also left it unadorned with ads or anything specific.
I'm planning to move on to do the Indianapolis and Buffalo Federal League parks next, I maaaaaaaay also try Newark's. The reason I didn't do these three originally was because I didn't have much information and I was just starting out with making stadia. I've gotten a lot more experience and think I can do OK with Indy and Buffalo, but I'm still not convinced I have what I need for Newark...
Anyhow, as ever, enjoy!