Fair enough, I suppose. But then, that's building a custom boat. You can build it so that other people would be more likely to want to buy it from you in 5-10 years, but you might be sacrificing something specific you want that might turn others off. Personally I love the sheer and profile of a DE design, but am all for modifying the bottom to gain some speed from it if at all possible. Yes, some of the advantages inherent in the design are perhaps lost in doing that, but compromises are made in the construction of custom boats every day.
Also that boat is a 42', with what appears to be a spray/lifting rail molded into the hull to convert the soft chine into a hard chine.
Harbor - The purpose of that large keel/skeg under a rounded chine downeast boat is to 1) keep the boat from rolling and 2) keep the boat tracking straight.
Hard chined boats use the "hard chine" to keep the boat from rolling.
This "user modified" 35 Duffy (who apparently knows more about boat design than Spencer Lincoln) has neither a keel nor a hard chine. I would guess you could stick a loaf of bread up in the tower and shake the yeast out of it in a decent blow.