It's not a matter of "pulling it off", as you say. It's a matter of that kind of design is intrinsically flawed as a concept. Basically, *not* having an optical drive built-in means having to carry one with you, separately, everywhere you go so that any time you need to stick in a disc (CD, DVD, DVD-DL, etc.) you can do it. Which then means having this stupid a** external box hanging off your otherwise aesthetically-pleasing lappy.
And if you forget the drive, or lose it, or it dies, you'll have to go get another one.
Now, the way Sony implemented the interface, on the earlier series it used a proprietary PC/MCIA-type interface, and on the second series it connected via USB, but in BOTH cases you had to buy the whole shebang from Sony, since third-party optical drives would NOT boot the computer (thus making it useless if you needed to nuke-n-pave), and then as that equipment was no longer being manufactured and eventually the product just simply was no longer anywhere in the distribution chain, those laptops are now basically worthless because you simply cannot nuke them and may or may not, depending on the model, be able to get a non-Sony external optical drive to work.
Now, clearly, Apple isn't Sony, and so this could all be rectified by an external drive simply attaching via Firewire. But it's still a bad way to design a notebook.