There was a firm some years back by the name of J Peddinghaus based in Germany (I cannot recall the address but perhaps one of our German readers may know). I seem to remember that they produced a Seehund and Biber (full hull or waterline) also conning towers to 1/32 scale like U441 with the Vierling at the front (U Flak 1). I think that Verlinden produces some of the midgets also.