This is actually pretty difficult this swap around. When the heater controls move down to the original head unit position the cables need to be bent a lot more than when in the original position and given that they've been replaced with longer ones, this makes the dials much harder to turn. I managed to break both plastic dials they're that hard to turn now.
Not only that but the gap the stereo is being moved too is too narrow for the stereo by about 10mm or so. The electronic clock clips into it's own aperture and would need moving I think as there is plastic in the way and you would need to make own mounting panel.
The problem with the dials could be got around with even longer cables I reckon, if the was room behind the dash. They'd just have a bit less of a bend on them.
The stereo is in a stupid place right down there agreed, and most people are likely to spend far longer fiddling with that than the heater controls. I just thought I'd clarify a few points as this is not the straightforward job it seems!