You can think of a "series IV" - leaf springs retained (although the parabolic ones provide for much more comfort), a lot of flaws sorted out: seating position, contact corrosion as it's converted to steel, wider framerails which allows for the 100L-tank, improved LT85-gearbox and transfer case (no ATF anymore), etc.
Power from the IVECO engine: Well, Santana had its own version of the 125HP-setup developed as they reduced torque to 275Nm to make life easier for the drivetrain. The drawback: IVECO ratings are SAE (without accessiries), although they say ECE. So the engine might have 115HP/260Nm for real. As the strongest version in IVECO Daily is 145HP/320Nm, some add-on electronics can be used without damaging reliability. Please stay with models prolonging injection duration, not common rail pressure - this will do harm to the fuel system.
And a question to Srs II and III experts: Front axle is pure Rover, but what's the rear? Seems to be a version of the ENV, but I'm not sure..