Just a note re. waterlines on these models. The real thing did not have a waterline as such. The red oxide paint was extended up to the bottom of the bulwarks because when fully laden they sat quite low in the water. Also, they had a curious stern down posture, with the point of balance occurring just ahead of the wheelhouse. Just look at any old photos of the originals and note to angle of the bow/mast to the horizon--definitely not at 90 degrees! This was a distinguishing feature of puffers, as opposed to the later VICs. When empty or carrying a light cargo, the effect was more pronounced. The waterline shown in the plan is false, as is the case with most kit/model photos I have seen that show the model sitting primly on a conventional waterline.
For this reason I intend to try a 6V battery in mine, which will add a little more ballast for a fully laden look, while my Graupner 4.8V-6V smoke generator should produce a slightly greater volume of smoke. Motor speed can be controlled with the throttle stick.
I'll post some pics of the model in the water when I get around to finishing it!