Wow this is like most "cribbed" out basement iv ever seen!!
The brickwork give an antique/vintage feel to the whole setup which is different. Great planning on the build.
What are your coral stocking plans? SPS & LPS or will there be some softies?
I'm a fan of the PAR38 bulbs. But do u like the spectrum they produce?
What colour temperature will you be using?
I was looking for spot light options for my new tank, I really liked the LeDio spot lights they have a good range. But since I was going for a SPS dominated build I opted for another lighting system with broader range. My tanks just 2.5 months old it's holding up pretty ok till now. Im documenting the build on my thread, but it's not grand as your amazing build.
But your ideas are inspiring me to get some LED spotlights to accentuate or highlight some select areas giving my tank an "abyss" look

The redesigned rock work looks much better and more aesthetic.
Good luck to ya and keep updating
Happy Reefing!!