What advice would you give someone starting this project? Throw together a "mock up" of your bag on the floor. Fold each fabric into the approximate shape of the final bag pieces and put them together to simulate how the finished bag will look. Then step away from it and see how it feels before cutting into anything. It is easy to try out different combos this way until you are totally happy with it. I always wait to cut the straps until the body of the bag is done, just to make sure I still like the fabric choice after the bag is assembled.