how to build a pitching mound bullpin
1 Nail the plywood to the frame of your wooden baseball mound. 2  Staple an outdoor carpet to the top of your wooden baseball mound. 3  Screw a 1â 1Ã4 to the top of the wooden baseball mound and use it for the rubber. 4  You are finished building your wooden pitching mound.5  It is time to play baseball. Nail the plywood to the frame of your wooden baseball mound. 2  Staple an outdoor carpet to the top of your wooden baseball mound. 3  Screw a 1â 1Ã4 to the top of the wooden baseball mound and use it for the rubber. 4  You are finished building your wooden pitching mound. 5  It is time to play baseball.