Not really feeling the cover, but loving the content.

I agree about the cover. Not that there's anything wrong with the photo, it just doesn't project that you take your work very seriously (and the portfolio 'title' sort of makes it seem like you're taking it too seriously in terms of your level of design experience) . The second spread (with just your name and the school to which you're applying) would make for a much stronger cover. 

I would rethink the order in which you present your work. The GSAPP stuff is the most relevant and the strongest, so it should come first. Then maybe the hand drawings and models, and then the photography. 

I would probably take out the graphic design section, since it's the weakest part of the portfolio. Maybe the machine/drivetrain stuff too (though it does speak to a range of ability that extends beyond aesthetics, etc., which is good). If you keep it, it should probably all be condensed into one section and made a lot more visually compelling.

Why are you applying to those schools? They all have a pretty substantial digital focus right now, which doesn't seem to particularly jibe with the experience you're presenting.

i agree with mr.minimal, at first i though you had no experience with architectural design, that should be first, then everything else as an "I can also do this!" Also, your photography is great, perhaps you have an architectural photo that could be the cover?