I don't know if this helps or not, but for the front end, I have heard that a TIB->TTB conversion is difficult (i.e., the engine cradle needs to be replaced). I also have a 2WD (a 1997) that I wanted to turn 4x4. I did a solid axle swap (I replaced my front TIB with a Dana 30 axle from a Jeep Cherokee, but a Dana 44 would be just as good and probably better), and it cost me about $1000 for the axle swap complete (leaf sprung), and then about another $150-$700 depending on if you want the front locked, regeared, etc.
It's definitely do-able, but will take some time and money. I bet you will feel good if you built that 4x4, but I am just expressing my own emotions.