I can't help wondering how they changed the whole drive train of that jeep. Or did they just drive it around in reverse all the time?
All that armor plate and three man crew must have maxed out the weight limit.
I think you can see how over-weight it is by how far down the springs are compressed on the "front" suspension.
I wonder how much armour it could carry? No more than 5mm, I'd guess.
As to the drivetrain, I suspect they simply placed the front axle on the "front" and the rear axle on the "rear". The transfer case is in the middle on the original Jeep IIRC so the engine would simply drive the gear box and then the transfer case. They'd have to then reverse the seats and put the steering wheel and box at the "front".
It is a well thought out design and must have taken some time to build but I don't see it beyond a well-equipped base workshop's capabilities. The 57mm Rcl is a bit over the top though...