HMS "Willamette Valley" was a different class from the standard WWI merchants. All those were reciprocating steamships. "Willamette Valley" was a motorship owned by Reardon Smith before being used as a Q-ship. She had a lot of near-sister motorships built in the 20's and 30's that worked for the same line.
If you look on uboat.net for British merchants with "City" in their names you can find some of these near sisters from Reardon Smith (Bradford City, & Vancouver City etc)...they usually have a short funnel with black "S" logo, low midships island, and square panels on the bridge wings. If I remember correctly there were about 10-15 of them in 1939.
A nice design, and in my opinion they deserve a detailed model.
