There is a 1 1/2" inner border, then a 3 1/2" border (the original outer border, then I added a 3" border and now this one. If I make this one finished at 10" I will have added 13" per side which would be total 26" length and width. If finished at 8 " then added 22". Hopefully that is enough. I have backing and batting for a king, so I am ok there. So will 10" be too much?