I've always been concerned about the QSS small merchant/small Q-Ship model - it looks like someone scaled it differently from other ships. There were certain optimal measurements for cargo ships of all sizes, and it just looks skinny and oddly-proportioned, with a strange shape to its decks.
In my opinion it should be easy to replace this model with a real Q-Ship, like HMS "Cape Howe" (AKA "Prunella") or HMS "Willamette Valley" (AKA "Edgehill").
https://uboat.net/allies/merchants/ship/394.html
https://uboat.net/allies/merchants/ship/373.html
"Willamette Valley"/ Edgehill was a good choice as a Q-Ship because she looked like many other merchants. The "Reardon Smith" company had a large fleet of freighters that looked like sisters or near-sisters to her - flush deck, low funnel, and panels enclosing the bridge wings.
"Cape Howe" / Prunella was also a pretty good choice with similar, generic looks - midships deckhouse, two masts, and 4000 - 5000 tons.
Unfortunately for the British, the Q-Ship concept was a total failure in WWII! Unlike WWI, many WWII U-Boats carried over 10 torpedoes, and submerged attacks without warning were more common....both these ships were sunk with many casualties.
The US, as you may know, had an even worse Q-Ship disaster, when the "Atik" was sunk with no survivors.