@Troy Gravett nailed the other items. 

your numbers seem high in some places and low in others, but i dont know local market costs for things, I would be surprised if you could get title done for $450 total,  most of the auction houses nail you with $1500+ for title and $1500" to close, they make a ton closing your deal, (like auction.com, H&M ect.) the numbers look good, but just know, it never goes as planned, and their will be hidden expenses you didnt see, i generally add $2000-$5000 for Misc.

You know, most every tenant does make a security deposit...4) Moral/ethical: "your surname looks Polish.

@Mark Creason nails them above.  

@Marcia Maynard hit the nail on the head.  

Somehow, getting those people nailed down makes it feel more real to me.  

Besides it looks like espostos siding which nailing into isn't easy or recommended. 

There's been some movement in the slab, and I noticed the nails on the braces connecting the floor joists to the central beam have loosened a bit.Thanks in advance!

Nail on the head @Jay Hinrichs.  

Next I'd nail down the subfloor panels and lay a rubbery cork like material over subfloor.