Spence, if your friend had the money to spend, more power to him, he got a quality ride. And if he couldn't do the work himself, then I can see paying to have it done. I don't have that sort of coin to toss around, and I've been a patient guy. Even so, I think one could cut a few of those corners to get what you want in a SAS'd Libby. Nobody makes kits to do that so a lot of fab would be needed. I've never looked that close at a Libby so I don't know what it would take. But I could imagine starting with a ZJ or TJ long arm kit (and plan to modify parts) and deciding on springs after the inital fab work. Doesn't the Libby come with the Chrysler 8.25 and rear discs?
I doubt Ford and Jeep talked to each other when developing the Ranger and XJ, but it is aweful nice that there are some similarities in dimensions. Which is why the D30 swap into Rangers, Bronco 2s and Explorers is so popular. Of course, cheap to do is good as well.
Back to the original poster... Summit Machine has stuff you can use, Teraflex has stuff you can use too. Local folks. Great to chat with. Blue Torch Fabrication isnt local but has lots of parts that the local shops could make too. Ready made kits for 4 links are also available through SuicideDoors.com, they make links whatever length you want. Plenty of ways to get things done without breaking the bank.
I'm not into punching babies (even though I do hang at the Pirate now and again), but I've been know to kick kittens...