Well thanks everyone for helping me deciding which route to go. And here is the outcome:
And in action:
I bought the kit which came with everything (even the mesh) but the problem is since the mesh is black, it is blocking noticeable amount of light. I was thinking of moving to white mesh; will that help?
And now my questions was "how can I feed my fishes!". Since the legs of the light are resting also on the frame so I had to do something. And came up with this idea:
I will put a small egg crate over it to help block that one too
Anyway, I have some small spaces uncovered due to the HOBs. Tried with egg crate but didn't seem to help much. Any suggestion about that?