Not stupid at all, actually. I'm not a coral person, myself, so someone else will chime in about lights.
Actually, just to put it into perspective, upon googling around, I found this:
.All-Glass AGA brand cabinet 54 corner tank-black fob-0 special shipping
Same tank, brand new for around $323, plus shipping of course (company is in NY), god knows how much that would be. You're looking at this used one w/ all the stuff included (most of the stuff is really better left for freshwater). Then the rocks, UV filter, and bags of salt are included, so that adds a little value, but again, the tank linked above is for a brand spanking new one that is not likely to have any leaks or scratches. Plus of course warranty.
I suggest getting a better skimmer...maybe an Octopus skimmer. They can be costly, but they are amongst the best. They make a hob (hang on back) version if you don't have a sump.
You'll also need more rock than what they have. If you want to save money, just get more dry rock. You'll just have a longer cycle (I used all dry for my 125g originally. Cycle took a few weeks). If you have the budget, invest in a few pieces of good live rock and mix w/ more dry rock. I'm not sure what that red rock is. Hopefully it's not some type of lava rock. Not sure if it's the one that leaches out metals...if so, not good for the tank.
Ditch the driftwood, fake seaweed, and porcelain duck too LOL
I'd get new sand (doesn't need to be live). Aragonite sand is great. Don't do crushed coral (nitrate factories.)
If anything, you could show that link to the guy to put it into perspective for him, and see if he'll deal.