- I can already see the lovely lines of the finished boat . . .
Be careful when squaring up the edges you don't lose the lofted shape. You really only need one accurate corner on a mold edge, which should be on the station mark, and generally faces away from midships so the stringers can rest on the accurate edge. There's no real need to square the mold edges except for one or two around midships.
There's no need to bevel the mold edges for a one-off either. For a building mold that will be used many times like the pros it is done for durability, to give the stringers a better land, but extra material is then provided for beveling.
Boats are like rabbits: you can have one or many, but not two - A. Onassis