Hey Aaron, it can be done. Not sure about the jeep dana 30 parts, but I did mine using front calipers and backing plates from a mid to late 70's chevy 4x4. The rotors and hubs are from a 78 cj5 with the 1 1/8" rotors. You have to use your jeepster inner hub bearings and the cj outers. Then you have to grind the closed knuckle between the 2 back bolts in a half moon shape till the caliper will clear it. It saves a little knuckle grinding if you grind the casting marks off the calipers also. Then you have to change the fill plug on the knuckles to an inner type plug(which will need to be ground down after its installed also). The final stage is a new master cylinder from the 78 cj5 with discs front and brake hoses to match. I'll be putting it on my webpage as soon as I find all my lost pics from the puter crash last week. Hope this helps!
(BTW: No Excuses, Inc. in NJ sells the kit, complete, except for the calipers, I believe, for a decent price) Their # is 1-800-923-JEEP.
Sprungover `71 Jeepster w/ lotsa goodies /wwwthreads_images/icons/smile.gif