Hello, now that I have graduated to sewing 1.1 sil I am looking at making a new tarp. My current hammock is 11 foot long. What shape and size would you recommend? I have read a lot of threads about tarps but am looking for the real benefit of cat cuts? Seems like minimal weight savings. Will the tarp pull out tighter with them? I think my goal for a tarp is using cuben fiber for the top and a shorter layer of sil for the bottom to save some money. Would I be OK to just make it a rectangle and add appropriate tie outs? Thanks!