filled the small ventilation openings and cut out the missing shell ejection opening for the engine mounted 30mm Mk108, this opening is on the right side, found a pic of proof, the drawing in the JaPo really shows it on the wrong side
seems logical that the opening is on the right side because the 109 center racks are offset to the left, so there would be not enough free space for the shell ejector
1 attached image. Click to enlarge.