As a CW Living Historian for the NPS I am quite familiar with the Hunley and have belonged to the Hunley Foundation since day one. It is far more technology advanced then originally thought.
The model kit I have seen if I remember correctly has the torpedo spar in the wrong spot on top instead of bottom, but this was not known until the Hunley was recovered.
The best book as far as life in a submarine is Iron Coffin, written by a survivor of the U-Boats....some very tough experiences.
Just now beginning to figure out what tools etc I will need to do a good beginners job...my first will be a submarine that is for sure....