Q ship appeared in WWI, Liberty ship existed in WWII. Different Hull scale, shape, superstructure design. Q ship looks more classic. Q ship will hide its weapon to attack submarine suddenly. Liberty ship has guns not hidden.http://www.vlib.us/wwi/resources/mymysteryships.html
This is the reference of "Zhan Dou" series, which is a very interesting and unique period in the 1960s:
http://global-mariner.com/index113-1940-1949.html