Depends on size of the ballpark and whether or not it can be worked off of ladder jacks or you need a boom lift.I am sorry but I am a little confused, is there normally soffit and fascia in a ballpark that has a regular price?
Are you serious or joking? :no:Call a local siding company and ask for the production manager and tell them you are looking for work and want to compare the labor prices they pay with what you've been offered by someone else.
They may low ball or high ball you if they think you're fishing so speak the language. Don't sound like a homeowner.
Or look for pickups and/or trailers loaded with siding tools stopped at gas stations or restaurants or siding supply warehouses. Ask those guys. They're installers and will probably shot straighter with you than the managment. Make sure you're in your company truck.
I always paid by the running foot and increased it according to the width of the OH and the size of the soffit. Eight inch beaded paid more than 16-18 inch alluminum.