The answer really is it depends. it depends on what you're trying to accomplish, your particular set of skills, and how much time/money you're willing to spend on the project. link & coil setups tend to be more involved and time consuming but offer a better level of fine tuning and overall versatility. Leaf setups can be thrown together much faster, are far more forgiving, and can perform just about as good as the more complicated setups. It just all depends on what you're going for. I would say Dan's setup is on the more progressive, detail oriented side... its definitely not a beginner's SAS (say, compaired to mine).

generally speaking, the Jeep Wagoneer D44 tends to be the obvious matchup... but thats not to say there aren't many other axle choices out there. You won't have to extend the frame rails, but depending on what leaf springs and shackle setup you choose, you may have to locate the front spring eye's as far forward as possible. I think most everyone makes their own shackle and spring hangers themselves though I'm sure you could utilize some toyota SAS or some generic weld-on tabs/buckets that a lot of these fab companys make nowadays.

-Rob