KB's are super narrow. the the front ends are very long. The LS series engines would fit in the engine bay but the frame shock towers got in the way. I plan to fab up new ones. I didn't realize KB 5+ fenders bolt on. With all the money spent already, I can't justify spending more on other fenders and they would not match the Patina that is currently on my truck. I don't know about serious rock thrashing. I just want to be capable. I'm tired of being the slow guy/going around obstacle or parking my truck. 2006 GMC 2500 Diesel 4x4 isn't not made for the fast and fun off road life. Towing suspension is "Like a Rock". I would love to see another KB build, post some pictures here or if you have a thread let me know. As you can see, mine is not complete either. I just keep adding one part at a time. One day, I'll be able to drive it. Good luck with your build.Very cool thread, Nice build. I'll be following this one for sure.