In total agreement about the floating roof. It's an iconic part of the Range Rover and replacing it with black or silver takes away from the elegant window and roofline.It will look exactly like this, and it doesn't matter as much here, but I'd keep the body colored roof, think the floating roof is just as iconic as the range rover lettering on the front/back
http://www.romansinternational.com/car/944/range-rover-4-4-sdv8-autobiography