Very nice !
A couple of thoughts:
* buy a cheap silicon skin to protect the back and edges of the plastic body: this would require you to increase the size of your alloy brackets, but the rubbery grip would make the Tab much more secure in the stand cradle.
* get rid of this awful useless screen protector
(Gorilla glass is tough enough, and the silicon skin would prevent the alloy brackets to touch the display anyway)
Keep up the good work, and let us know about your incremental improvements / design revisions !