I don't know where there's a writeup, but it's a pretty simple proposition...there are 2 shift rods coming out of the t-case, you need to take off the metal piece that connects the 2 together and hooks to the shifter, and make a bracket for 2 shifters (2 stock ones will work)...fab up a piece to connect the shifters to the shift rods, cut a bigger hole in the floor, add a 2 shifter boot, and you're done. I considered doing this when I did the T18 swap, but with a Jeep D20, you don't get anything extra...one shifter does t-case hi-lo, the other does 2wd 4wd...so you can have 2wd low, but my nicely worn t-case does that with just one lever. You need a scout D20 to get the front axle/rear axle settings.
Basic jeep rule of escalation:
The more projects you finish, the more you will begin.
The better welder you become, the more things you will find to weld.