I've personally (mentioning no names) rebuilt a diff like this for someone - there was no glue on the diff rings and no grease on the diff balls. I'm of course not saying that you didn't build the diffs as per instructions but blowing 2 diffs simply shouldn't happen.
I'd have thought the diffs slipping would cause this - but the one I rebuilt was down to the rings slipping on the plastic holders from what I could see.
As long as the diff rings and balls are still in good condition then you'll just have to replace the pulleys. If you're using the original stuff then pay close-close attention to the build steps, degrease and glue the rings with some sort of flexible strong glue would be best.
The 501X diff halves work on the metal-metal friction - which should stop the diff rings spinning, and it should only really be needed on the rear as the front won't have enough torque to threaten the Durga diffs if built correctly.
If this was genuinely your first time out with the car then be aware you'll have to keep checking the differentials as they bed in - since they can loosen slightly and begin to slip, which could also have been the cause.
Let us know if you need any help - the Durga is a great car
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