A 23-foot cutter lies adjacent to the wreck of HMS Terror (Franklin Expedition, 1845–1848). Historical accounts of the 28-foot boat found in 1859 at site NgLj-3 in Erebus Bay (“Boat Place”) describe extensive field modification, including lightened upperworks, an altered rail arrangement, and a 9-inch weather-cloth supported by iron stanchions that also served as thowells. This paper uses reproducible image-processing methods to test whether the cutter preserves visible features consistent and convergent with elements of the NgLj-3 modification suite. Using still imagery, contrast-limited adaptive histogram equalisation, colour-index segmentation, and gradient-based seam detection, we assess three markers: anomalous rail height relative to the stemhead, preferential loss of upper planking, and a rail-mounted upright compatible with a stanchion. The imagery shows a pronounced mismatch between rail height and stemhead elevation relative to Admiralty cutter plans. A sub-gunwale void consistent with missing upperworks, which is notably similar to the strake replacement described, and a small upright feature of approximately the same order of magnitude as the reported weather-cloth height. These observations are suggestive rather than diagnostic, but taken together, they support a hypothesis that the Terror cutter may preserve traces of field modification comparable to those described at NgLj-3.