Quick Help: Is this a lock?

Hi FOlks, can you help me confirm this, this is a 3 hours after i have put them together...

http://i1088.photobucket.com/albums/...4/IMG_0231.jpg

http://i1088.photobucket.com/albums/...4/IMG_0230.jpg

http://i1088.photobucket.com/albums/...IMG_0228-1.jpg

http://i1088.photobucket.com/albums/...4/IMG_0228.jpg

Yea Im pretty sure it is. If they arent locked they really close to it.

Looks good to me. Congrats and good luck.