Now if the battery is subbosed to be part of the bottom case, the whole venting system and hinge mechanism would have to be changed. Right now the big Vent in all Macbooks is in front of the display hinge. the head pipe ends there. Now if the battery was on the back like this, there'd be no space for the heatpipe... I don't think Apple would sacrifice the clean design with no apparent fans for a larger battery.
...Maybe the missing part on the bottom case is supposed to be plastic like on the EDGE iPhone? Powerbooks and Macbook Pros have been worse in the WIFI reception department than their consumer counterpart with plastic case. Then again: bad design choice.
I can imagine that the cut out part is the front (under the trackpad) and not the back (at the display hinge) of the case. The macbook has the battery and the hard drive there:
Now picture a metal flap covering the battery and the hard drive. (The RAM modules might fit as well as the Macbook Pros are larger). Removing this flap would give you tool-less access to hais hard drive, RAM and battery. One can argue if it's a good idea to have that easy access to the physical HDD on a laptop with sensitive data on it... filewault only (kind of) encrypts your home folder. I also doubt Apple would drop the status lights on the batteries. Those would be hidden when covered by the flap. The functionality could be replicated somewhere on the case (status lights hidden under speaker grille holes or the vent on the back, etc.), but that's not Apple-like either.
I disagree with an earlier post stating the case needs no testing. A laptop's case is, in my opinion, very important to test. Consider things like
- is the shape on the bottom comfortable to keeo on your lap?
- Is the case prone to warping when heated from the computer parts or from outside?
- Does the case interfere with the circuitry? (Remember the early Macbooks where the heatpipe touched and short-circuited the logic board when expanding due to heat)
- Is the hinge prone to squeaking?
- Does the hinge open wide enough?
- Does it feel awkward?
Most cell phone manufacturers and laptop-makers got this wrong on so many levels. On my (noe sold) Sony Ericsson Phone, the volume rocker was opposite the play/pause button. When you adjust the caller volume while on a call, you usually press the play button and music starts playing from the big speaker. Just an example of a major design flaw that would have been discovered with proper prototyping. The iPhone got it right. when holding it in my left hand, my thumb can acces the volume and ringer switches and the index is right on the sleep button.