I haven't done a new model captiva, but while it's different from mine, it still looks similar. The silver coloured surround around the radio will pull off- I recomend some plastic trim joggling tools- I got mine from ebay and a heck of a lot of patience. In the old model, the silver panels either side of the radio which contained the dash heating/cooling vents came off in this manner. They have 4 or 5 spring clips in each and as I say it was simply a case of taking one's time and preserverance. Behind the facia the raio is held in with 4 10mm bolts.
Iain