Although I cannot answer your question (I am not an expert in damage zones) I should point out that you should be more specific in pointing out which Small Merchant you are talking about as there are two in GWX. One is the stock Small Merchant, and the other is the Belize freighter, which looks the same as a Coastal Merchant/Tramp Steamer but with only two cranes, a slightly different bridge, and a straighter bow. Your description could refer to either of these, as they both have two derricks fore and aft and have only one funnel (and are identical tonnages - about 2300 GRT).
