The base for this project was in a box of old boat stuff and was the inspiration for this light. You could make a similar base using .060 copper sheet, notching the corners, forming the copper over a piece of wood and soldering the corners. It might even look cool to just make a 1" cut at each corner then form the base and lap the "flap" over the corner and then solder it up.
Step 1: Whatcha gonna need
One (1) copper base 3.625" square X 1" deep.
One (1) 110V AC to 12V DC generic power supply.
One (1) female 12V plug to match above male plug
One (1) Ultra-bright cyn (color) Luxeon star LED
One (1) High Power LED driver (Velleman K8078)
Some 16ga. copper wire