Dimension of board and locations for holes in simple text:

Get yourself a 1/2" piece of plywood that is 24" wide x 36" long.  You'll need a leg assembly to hold the board up or you can lean it against a chair, etc.

Make your holes centered at the following points...

Hole size: Distance from left: Distance from top: 2" Label:
4" 12" 5" 3 BASES
4" 7" 9" OUT
4" 17" 9" OUT
4" 12" 13" HOME RUN
4" 7" 17" 2 BASES
4" 17" 17" 2 BASES
4" 12" 21" 3 BASES
4" 7" 25" 1 BASE
4" 17" 25" 1 BASE
8" x 5" rectangle 12" 32" FOUL