A copy of a line drawing from Peter Elliott's "Allied Escort Ships of World War II: A Complete Survey" (1977).

The details he has given (on page 206 of his book) are:

Built under the 1943 programme
Name: Rushen Castle
Pennant No: K 372
Job No: J 4782 *
Builder: Swan Hunter
Building time: 10 months, 18 days
Completion date: 24.02.1944

*        Presumably an Admiralty job no.  The shipyard job no. was 1780 – see article.