Which Motor
I obtained a Talacre part built and its now complete. The plans show the top bridge reversed as the original had the steps facing aft but I only found this out after I had built. ?You can find details if you Google search.
The model is not that big and I used a direct drive 555 motor with a 7.2v NiMh and Mtronik ESC driving a three blade brass 35mm (I think) prop.
I get hours of run time so I don't believe you will need a geared motor, just a low current drain high tork motor for 6v use.
The hull is quite flexible and will need internal bracing to bring to the correct lines. Mine had not been built this way and I had to rebuild one side to correct the lines.
The instructions are good but there are lots of parts and I suggest you identify everything before you start. it is a real builders kit and the parts need careful "fetteling" to produced a good finish and fit.
Hope this helps
Enjoy your building
Dave
Dave