It's sitting directly on the slab foundation. So no worries on the weight.
The lights run about $900 a pop at MarineDepot, but I already have one that I'm pulling off my 110 gallon that just got decommissioned.
Co2 reactor will be incorporated into the sump so that Co2 gets sucked up at pump pick-up and shot into the tank. I've found this works awesome and doesnt require an additional reactor chamber taking up precious space.
Havent gotten the bid back for the Starfire tank yet, but its going to be one of the cheaper things..... All the contractor work running drains, water lines, extra electrical circuits and building a custom bookshelf stand is by far the most expensive part of the project. Whole project is going to top out somewhere around $20k when its all added up
The reef keeper elite is definitely overkill. I've actually run very successful high tech tank with just the simple Aqua Jr. controller.