I am not aware of a cutting mat that is 12x24 ...
But! I do have a 12x18, and I would be able to put my twenty-four" x 6 ruler in there ... or a good sized square ruler for rotary cutting.
SO, I am asking that when you have the pattern ready for sale that you just post the market addy on this thread. Is that doable?
I don't spend a lot of time looking at even recent topics, and I am scared to DEATH to go anywhere near that place that they are selling things!
I do NOT window shop ... it is a very bad form of undisciplined personhood, but that is me. I will be watching <G>