An older Bill Dixon design made by a high quality
builder in the UK. A bit old fashioned (naturally; the
boat is 30 years old) but these are solid, well-made,
seaworthy, and comfortable
boats, if a little cavelike below as
boats of those era tend to be.
Stern extensions on plain transom boats are pretty common and should not be of any concern if well executed. Nearly all the
Oyster 53's of the '80's, for example, were converted to 55's by adding a stern extension.
Centerboard boats are a compromise which make it possible to have a decent deep
keel while being able to pull the board up for shallow
water. If you are sailing in very shallow
water (Bahamas, some
parts of
Florida, ICW) then this could be a plus; otherwise it is a negative since you have a whole mechanism to deal with and can give trouble, and a centerboard can't be made to be as good as a fixed fin
keel, especially a bulb keel.