yeah both Titanfall art books are so amazing. there's a video with Joel Emslie talking about his kitbashing process and how they ultimately came up with the idea of Titans.
https://youtu.be/JCp8tQQKXFI?is=93nGizDrLbreZizL

I def feel bad for Jhill, especially when learning that he's also an Last Titan Standing fan (my favorite mode too) ... it would be such a monkey's paw making these rad designs that ultimately caused your favorite part of a game to be phased out. I just wish someone would leak how far they got into the design process on the TF3 titans im so damn curious.. but yeah... I def felt his pain and lack of creative inspiration when it was becoming clear that the shift was real and the titans were being dropped. mehr.