Brian,
The aspect ratio of the 24x48" field (22x46" playing field with one inch sideline borders) is very close but not perfect. A real field is 160' wide by 360' long (.444 W/L ratio). The 22x46" playing surface has a .478 W/L ratio. You would need to increase the border of the sideline to 1.75" to get a near perfect match on the aspect ratio. That would yield a 20.5" wide field (with 1.75" sidelines) to get a near exact 0.445 aspect ratio.
For "playability" I'd rather take the extra board width than try to get the exact proportion. Each base is 0.5" wide so reducing the board by 1.5" will result in 3 less "alley" for a base to run. The nice thing is, with each field cover you buy you can do something differen (if you wanted).
Hope that helps,
Joe
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