Holy cutaway batman!!
I made a bamboo backed hickory bow, 62" 65# @ 28" and it had a cutout about like that, maybe not quite past center, but to center.
I could should arrows fletched with plastic vanes out of it cleanly. Only found out cause the bow ot finished before the arrows and I had some cheapo carbons lying around.
Good luck. and btw the plastic vanes did fly awesome. Weird shooting a wooden bow without the hiss of feathers throuh the air