What you really should do is make some line drawings of what you are planning. Then we could get into a healthy asthetics argument.
I guess, I don't really see that it would add that much weight. May be missing something.
I have a pretty tall dog house. It is a bit of a PITA to see around. However, I have standing headroom in the cabin in a 27' boat, so I shouldn't complain. John Vigor thinks it is unsightly.