i recall seeing that a few years again insane! and max respect for doing a proper 'off road' test and not doing it on public roads! looks like the bulk head was majorly modded to get the engine to fit, i suspect its RWD too
well since it is rear wheel drive the bulk head and transmission tunnel will have to be applied to the car, so this is pretty obvious,
not necessarily have no dash, as the heater matrix etc will have been removed, as when your going sideways all you need is the window open to catch the air