I am planning on building a multi-purpose baseball / football stadium on my layout. It will be confined to a 4'X4' area. I'll be using:
*grass mat for the playing field
*real dirt for the warning track
*Lionel Double Yard lights for stadium lights
*1/4" dowels for foul poles
*1/2" styrofoam for the outfield fence to curve as needed (3" high)
*A home made "out of town scoreboard" printed with white letters on black background
*In game scoreboard with score by innings (Showing the Yankees losing 
*A 10" flat screen tv for a video scoreboard
*Scratch built stadium bleachers (wish me luck!)
*Commercially bought ballplayers
*Train related (and beer) advertisements around the ballpark
For football:
*A separate grass mat with yard markings to put over the field during fall & winter months
*Commercially bought football players
*A football "out of town scoreboard"
*In game scoreboard with score by quarters (Showing the Cowboys or Giants losing
*Goal posts at each end
Plans also include an adjacent parking garage, hot dog vendor carts and an American Flag in centerfield.
