I should have read things more carefully. I have a suggestion for transferring your patterns to the boards. I used to use this in my classroom because I have no drawing skills. I have a projector that hooks up to the computer (you could probably rent one) and project your image. Changing the distance from your board will change the size. It isn't perfect but for me, it saved a lot of time because I didn't have to do that drafting/scale thing.