if you keep the original box, i guess it would be fairly good. These systems are not overly heavy, so that helps. If you go the SG06 or SG05(i only pick these for the very small size and light weight) route, get the one with the 450 watt psu. It does not cost much more(and and can run a better video card) and comes with the inside painted black too.
The main issue many will see is that it takes some work to find a good cooler. If stock with its noise is ok for you, i think it is a good idea.
But remember, the laptop has its own screen and UPS(battery) all in a very small form factor. I guess it is more a question of what that is worth to you.