This is a scale model of an S-100 german wwii torpedo boat.
s-boat2 is the more recent version, and should be used in preference to the older s-boat stl. It has 3 mounting-points for guns, and the deck and engine details, and armoured wheelhouse shape have been somewhat improved.
There are still some errors in the model, which I will eventually correct, but the principle dimensions and geometry should be close enough for wargaming purposes. Scale to 33.333% for a 1/300 model, or 28.57% for a 1/350 model. The two gun mounting points are compatible with the quad flak-20 and flak-37 mountings for the f-lighter. A bow 20mm gun will be uploaded soon. Print all guns with the barrels vertical (or approximately so); support will be required for those, but not for the s-boat itself.
Edit: I have added german square and oval-shaped life-rafts, and a 20mm bow gun. The gun is probably best printed with support, with the barrel pointing upwards.