How are you joining the two pieces together? That joint needs to be strong so that an axial force on the screw does not bend the bracket. I'd be inclined to either make it out of one piece, or use something thicker for the vertical part.

Quote Originally Posted by m.marino View Post
Also Checking on available box Aluminium in the area but is looking like I have a really good source of off cuts (some over 2 metres) of 12mm Aluminium plate. Any and all views would be greatly appreciated.
Excellent, can I have some ?