Chapters 11 and 12 are pretty short. I'd also suggest you really do the Peg Leg missions. I know it's a pain in the ass to collect all the trinkets to unlock them but those missions are some of the best ones in the game.
The concept is fantasitc. The sad thing is that they do not explain how to level your artisans up and I don't know if it's a bug or not but none of mine would level until I collected them all, which I didn't do until Sequence 11 because I had no idea how to get the ones I was missing until I read the FAQ. I didn't get any of the upgrades until the Sequence 11 either since none of my artisans were high enough level/didn't have them all to craft anything. It is a really cool concept but is fundamentally broken for most people.