Well, when I made my last tarp I didn't bother with cat on the hems simply because I couldn't be bothered making more jigs. In all fairness, you are right Gerry, it's not a matter of life or death. Some have said the edges flap less in the wind with cat cut, that I couldn't tell you. When I said aesthetics, I meant the look of the tent as a whole, rather than the look of the panels. Looking at both the trailstar and some of the projects posted on this site, I would still say cat cut makes for a more pleasing end product. I suppose that is fashion. That being said, it is not the first time I have heard about cat cut spreading the load etc. In fact, it has been said that catenary is only a rough approximation of how the fabric actually deforms under it's own weight, but it helps.