If the left field wall had been constructed the same distance from the plate as the right field wall, there would have been little or no overhang, and seating capacity would have been increased. Land constraints wouldn't apply to the inside dimensions. Why was the left field wall deeper and higher than right field? We may never know.
It also seems strange that there were no dimensions marked at the foul poles or in front of the bleachers, yet the unreachable 483 to the clubhouse was marked.