Submarine:

USS Grampus (done)
Some North Korean Subs
Ghadir-class submarine
HTMS Matchanu
Tobe's Submarine from Pucca

Ships/Boats:

HTMS Khamronsin (currently building)
HTMS Nakha
HTMS Similan
HTMS Suriya
HTMS Phra Ruang
HTMS Khram
HTMS Phali (done)
HTMS Posamthon
HTMS Pin Klao
HTMS Makut Rajakumarn
HTMS Pharuehatsabodi
HTMS Ratanakosin
Srinakarin
Tor. 813 (done)
Other RTN patrol boats

Ekranoplan:

A-90 Orlyonok

My plans are full of Royal Thai Navy ships lmao