The matter of using a window that is square vs. one that is round is a matter of taste, and there is no right or wrong answer. However, one of the things that distinguishes the Marinaut from other boats is it's round window. My wife and I love it. Putting a square window on a Marinaut, in my opinion, is like re-engineering a Volkswaggon Beatle to look like a Scion Xb. O.K., that was a little extreme, but in time, the iconic round window will distinguish the Marinaut from other boats.
Now there is a counter argument. One of the reactions we frequently get from people who see the Marinaut for the first time is, "Oh! She's so cute!" We were at Port Jefferson last week, and a couple on a $1,000,000+ yacht made that very same comment. Incidentally, that gentleman was looking longingly at our boat, because deep down inside, he really wanted a smaller boat. He climbed on board, and was amazed at how well equipped she was, and her amount of living space. He was amazed at our fuel economy of 4.6 mpg (his boat gets .6 mpg in optimal conditions) and shallow draft. In my opinion, he probably fell in the same trap that many people do in buying a big boat to accommodate his large, grown family, only to find out that it is only he and his wife using the boat most of the time.
One last comment: when we go into marinas in the Northeast, we are usually the smallest, but cutest looking boat in the marina. People are always taking pictures of her, because in the Northeast, you don't normally see Marinauts or C-Dory's in transient marinas. However, she is not a small boat. She is actually 24+ feet from the anchor to the back of the engine. She just looks small because she sits low in the water. Not having a pronounced deep-V hull like many production boats opens up a tremendous amount of interior space comparable to boats much larger in size. Yet, she is astonishingly seaworthy, as are her cousins in the C-Dory line. So, she looks cute with that round window, but she hangs tough with the best of them. It's too bad Johnny Cash is not with us any more to write a song about the Marinaut much like his hit "a Man Named Sue."
Rich