My initial thought was, that our shelter was squared, and we were only three people, so we could safe some space by making it a tringle instead. I also changed the sides, making them mobile and able to move around accoring to wind and sun. last but not least i made the "roof" of the shelter waterproof. At the beach we used a sheet to cover the shlter, and had it rained just a little bit more than it did, we would have gotten very wet!