Since you're planning to use 2 driveshafts both coming from the same t-case to power both axles, you have to figure out how you're going to get the second driveshaft to go around the first axle and into the second axle.
I suppose you could flip the second axle around and upside down, so the pinion points backwards and the ring gear still rotates the same direction as the first axle, then connect a v-drive gear box from a boat to the pinion end of the second axle so so the second drive shaft can run above the first axle and change direction via the v-drive gear box.
