saab 9-5 conversion to awd

hello,

For some time i was thinking if it is possible to use transfer case from a saab turbo x or any other car that has transverse engine awd in order to make the engine spin rear wheels. The biggest chalenge is aligning transfer case with the rear diferential and the front wheels. Does anybody in this forum have experience with transfer cases and is it possible to use any transfer case on a b235 9-5 from saab x drive or lancer evo or any other car?i dont mind swaping the whole transmission to achieve this.One of contenders is a volvo s60/v70 r tranny or an awd from honda crv.