I can only imagine this being built up from a previously written off Prof. Don't think anyone would chop up their Prof to build this. I could of course be wrong.
Seen it before at a much higher price.
I am also not sure if it is a 6x6 or rather a 4x6.
Just imagine driving it off-road. The back axle not being driven will lift the driven middle axle off the ground, thereby making the it a front-wheel drive, provided the centre diff is locked.
If the centre diff is open you end up with a stationary vehicle a spinning middle axle and everybody else clapping hands.