Alright, got it painted and screwed, I am quite pleased with it. I couldn't find any drill bits for attaching the L-bracket to the heatsink so I just crazy glued it and then wrapped it with duct tape. Screwing it would have been more professional but it is really solid and and I am not too worried about it.
Amazingly, the holes on the bracket lined up perfectly with the screws in the fixture so I didn't have to drill anything.
Now I just need to add in the LEDS and the wire them up and its all done! It should be up and running tomorrow.