Hi man   
Welcome to Mobile Computing, I love your photos haha~

Some of the lightest 13" notebooks/ultrabooks are by Toshiba~
13"
Toshiba
Very lightweight subnotebooks with normal processors:

Portégé R930-2019, i3-2370M + Intel HD3000@RM3499[1.4kg], W7P, 4GB, 640GB (7200rpm), Microsoft Office Home & Student 2010; 3 years warranty, color: metallic black
Portégé R930-2001/R/B, i5-3210M + Intel HD4000@RM3099[1.4kg], 4GB, 640GB (7200rpm), W7HP; 3 years warranty, color: metallic black, red, blue
Portégé R930-2011, i7-3520M + Intel HD4000@RM4999[1.4kg], W7P, 4GB, 640GB (7200rpm), Microsoft Office Home & Student 2010; 3 years warranty, color: metallic black

Ultrabooks:
[Ultrabook] Portégé Z930-2002, i5-3317U + Intel HD4000 + 128GB SSD@RM3399[1.12kg], W7HP, 6GB, 3 years warranty; W8@RM3799
[Ultrabook] Portégé Z930-2005 i7-3667U + Intel HD4000 + 128GB SSD@RM4899[1.12kg], W7HP, 6GB, 3 years local on-site warranty, free notebook sleeves

...and of course, the fancy Samsung ATIV Smart PC Pro with tablet mode and stylus support
11.6"
Samsung [Ultrabook] ATIV Smart Pro, i5-3317U + Intel HD4000 + 128GB SSD + (1920x1080; touch)@RM3599[884g w/o keyboard], 4GB, stylus, W8; color: black

Oh I see, haven't joined LYN during your time 
The Z930 is made of Magnesium Alloy, not sure whether it better than aluminium body or not, but the rigidity is there
Here's a recent review on the Z930 (specs may differ abit): http://www.notebookcheck.net/Review-Toshib...ok.87043.0.html

anyone?