Hello, I recently purchased this pattern http://www.leathercraftpattern.com/leather-downloadable-patterns/Leather-bag-patterns/leather-backpack-satchel-pattern-pdf-download-ACC-101 and while they did come with patterns for all pieces involved, I have a question in regards to construction. This is one of the first bags I'll be making; in the past I have made tote bags by cutting out one piece, sewing inside out and then turning it right side out. However this pattern has a separate back, front and bottom. Any makers out there with experience making bags have any recs on how I can tackle this pattern? If I have a bottom, back and front what would be the best step by step of connecting these three pieces? Thanks in advance!