As to the Kibler question; I had built several scratch build flintlocks, bought an early SMR kit and found it fairly easy to put together although the early kit wasn't as refined as the ones that Kibler makes now. I bought my kit second hand for a guy who couldn't put it together.
I have a friend that had my gunsmith friend build him a Kibler colonial and then decided to try his hand at a SMR. He was an intelligent, crafty guy but had no gun building experience, I mentored his building via Facebook messenger. I had taken pictures along the way of my SMR build and shared advice and pictures with him when he got stumped, which was often. The bottom line was my instructions as well as the Kibler videos were Greek to him, he couldn't follow along. He finally finished his build but it took a long time, a month or more.
If you have an experienced builder around to steer you, go for it. You can build a colonial if you are a crafty guy, if you are inexperienced and carefully follow the Kibler videos and don't get in a hurry you can be successful. If you have "0" experience in making anything, no tools and no place to work buy a Woodsrunner instead. not much building to them as the video suggests.
I am a bow maker and have tried to teach a bunch of guys the craft, the majority of them throw up their hands and quit, they just don't enjoy the work that goes into making a bow or any other thing for that matter.