The human body surely includes constraints of time and space but is far more than such constraints.
Among many other things, your body reveals your status as a human being in the image of God, and entitles you to be respected by the others.
Actually the spiritual immortal soul is NOT contained in the body, but rather the other way around: the body is contained in the soul. The body is sort of highly complex soft-ware, through which the soul appears in and acts into the world.
Are you robbed of your laptop, or have you lost your mobile? You feel as if you had lost your hands. Mobiles and computers become more and more like extensions of our brains. So after you die, your body remain in your soul as a bunch of algorithms. In this sense you keep your personal bodily identity, although you cannot longer make decisions affecting your eternal destiny.
Through your bodily actions you create relationships that affect not only your contemporaries but even persons living after your death. The consequences of your actions will last in history till the end times very much like the messages or images we post in the web: they will remain and influence others forever.
The good we have done will be beneficial for many people after our death. At the end of history all this good will appear and thereby our body will reach achievement. And the other way around: we will also meet all the good we have received in our earthly life and those who have done this good to us. The resurrection of the bodies means this: All the bodies of the saints will come to completeness by being united through webs of love, and so they will be one in Jesus Christ and complete His resurrected body.
Your post inspires me many other thoughts.
Before continuing I would be thankful to know what you think about my comment here.