Not even sure I've spelled that right? 
I've made a rectangular door stop and made it with one long strip for four of the rectangule's faces, then made a top and a base. It looks great but getting the corners right was a tad tricky, so wondered whether I could make a 'tube' shaped one instead? Anyone got any experience with this? How would I go about sewing the edges of the tube onto the top and base? Would I have to cut little V shapes into the seams?