Well, if you've only got a 98" wheelbase, I'm not so sure you'll have room for the tranny, t-case, intermediate shaft, second t-case, and rear driveshaft. A divorced 205 setup would be pretty simple to find...but if you use 2 205s, you're only getting 4:1 t-case multiplication (2:1 low range, in 2 t-cases). So you could just use ONE t-case with 4:1 gears in it and have the same thing, without the extra weight, complexity, or intermediate shaft.
The marrying of 2 t-cases isn't really so hard. Lots of guys have done it, and there are now commercially available kits out there to get the job done. The use of a NP203 low range box is a very popular way to get the job done, and you could end up with a lower low range than the use of 2 205s would produce, along with a shorter drivetrain, AND you could get by without the intermediate shaft.
IOW, I don't think your idea will work on your wheelbase, and if it did, it probably wouldn't be worth the effort. So here are my suggestions:
1. Use a D300 with 4:1 gears
2. Use an Atlas with 4:1 gears
3. Use married dual t-cases using a NP203 low range box