Arnaiz - Great fields but like you said, not enough warm up areas for 14U and up. Sometimes in the yournger tourneys they will let you use the outfields.
Doesn't seem all that inconvenient to use the city park across the street and a block west. Lots of room there. The nets are a problem for sure. But having 4 fields set up for just FP, including permanent fences is pretty great. Fun to hit balls out onto the street beyond LF fence on the one field. It's like Waveland Ave or something.
Best regards,
Scott