This is like the case of the Three Little Bears. I have cutting mats which are too small, and I have cutting mats which are too big, and I need to make a cutting mat which is J...ust right. It can't be cut with a craft knife, it can't be cut with a rotary cutter, Butcher knife won't work, and I don't want to try the skill saw. I was thinking hot knife, but I dread the smell - an outdoor project for sure.
Any ideas?