I must admit that this view is really closer to the BG1 map : BG1 Full map We had in the same area Umberlee Temple, the Harbour Master and the Low Lantern, and the tattered sail is a strong clue indeed ! So maybe the map is a mix a BG1 mp and the official new map... and city geography might change a lot and is not a solid ground for my first deduction (for example the Blushing Mermaid was in the upper city in BG1 and in the Lower City in thje modern map !)
With apologies to everyone for this side discussion that only potentially might become relevant to Blood in Baldur's Gate ... having now spent some time getting my bearings with the modern day Baldur's Gate map, it looks as though the only place marked in what might be around the right place to be that boat building is Jopalin's Teahouse. My outside bet now is that the Low Lantern finally became untenable, the owners bought out Jopalin's Teahouse, and merged the two establishments both commercially and physically (and possibly magically). Of course, I'd be more stunned than anyone if that turned out to be true .
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"