<Gazlowe spreads the plans on the table and jabs a tiny finger aft of the ship below the waterline.>
There! The hull is thinnest here, where the crankshaft meets the paddlewheel. And it's right next to the magazine!
<name>, I can't be held responsible if some enterprising Horde <class> were to attach a limpet mine to that part of the hull. Not even if I supplied the mine. And paid <him/her>. Handsomely. The ship is anchored just southeast of here... go to it!