For the landing craft, Akitsu Maru had a slipway in the stern, which was closed with four petal-like doors when unused. However, I don't really know, whether the aircraft and landing craft facilities interfered with each other, nor in which of her configurations the slipway was active...
C.f.:
https://karano.exblog.jp/22062641/
https://www.aoshima-bk.co.jp/content...y/index/3/349/
https://images-na.ssl-images-amazon....L._SL1500_.jpg