I am considering building a few AR rifles for my self. I would like to get a thumper like a .458 Socom, a white .223 like the older arctic panther and more recently, an AR pistol that has been added to my want list. As far as a hobby, is it worth it to build your own AR rifle? I would like to have a better understanding of exactly how the work, etc.

Assuming it is still a fun hobby, do you all use an average lower parts kit? Are there parts you order separate and replace from the generic parts in the lower parts kit? What are your thoughts on where to buy parts, and what parts need upgraded etc?