We'll I've just done it. Ended up putting pioneer 5 x 7's in the fronts and kenwoods 5"s on the rear shelfs and the 6 x 9's in the rear door on the wagon running off a kicker amp(basically really running as woofers). Took ALOT of time, effort and thought but looks awesome and sounds really great. Can take some pics if anyone's interested?
AU XR lookalike wagon