Just got the body in, so the project commences. I'll try to show some detailed steps so that it will help others who are trying to fit Mini-Z bodies onto their XMods.
First thing's first. Remove the stock side body mounts by prying them off with a jeweler's screwdriver.
Next, remove the ribs that those body mounts were attached to with a sharp blade or a set of small diagonal cutters.
At this point, the body is ready to be test-fit on the car. Looks pretty good, don't you think?