It is the free plan from Model Boats. Balsa and plasticard. By coincidence I bought the Osprey book on Blockade Runners and thought of a model then the plan appeared in the magazine so how could I not have a go?
Three of my previous boats are steamers. A 1:12 Picket boat (Marcher engine, 3 pass boiler), An Admiral's Barge to match(another Marcher built from stock bar, no castings) and a 16mm-1 ft Simpson Strickland Steam Yacht "Bluebell" (Arnot Vtwin, vertical fire tube boiler).
The rest of the fleet are powered by "Galvanic Trickery" but the steamers are the favourites.
Regards,
BCF