Here are some images of Dave Porter's 1/72 scale Type XXIII U-Boat and here is his description.
This is a Alanger’s type XXIII U-boat in 1/72 scale. This was a pretty simple build with not many parts. Unfortunately the fit isn’t very good and the detail isn’t great either. The good points are that the kit comes with two very well molded crew members and the price is right for the model.I finished it Tamiya colors and artists oil paint.