Thinking of swapping

Ok so I have been thinking of all the upgrades that I want to do to my VX but I keep seeing other EG hatchbacks with most of some of the mods that I want to do for way cheaper than what the parts cost. Only thing is I love my D15z1 and tranny for the MPGs. So the question is does anyone know if I would run into any problems on buying a hatch with a blown motor or whatever and swapping in my D15z1 and tranny?