We put up a sign saying the pool had been treated with extreme amounts of HCL and if any 'workers' skin gets exposed to the water to seek immediate attention. 

If I was actually looking to make this deal happen, based on the amounts I described and would need to borrow, how much "skin in the game" would most lenders expect?

It is an Ultra 4k system with full-color night vision to 180 feet, three terabyte hard drive and eight outdoor cameras.

Most private lenders or institutions will want you to have some skin in the game requiring you to put down 20%. 

When you do your next flip, you'll find it much easier if you kept a detailed spreadsheet of appliances, vendors, paint colors, etc so that you don't have to remember or start from scratch.

There's lots of good used appliances available if you shop for a compatible color.

Its easy to burnout quickly taking on a lot of the work yourself, managing the project by itself is a lot more work than it seems on the surface (getting materials together, accounting, picking out colors/finishes, etc) and you're probably going to need to pull permits for at least some of the work anyway.   

I'm thinking of Restore or Deckover with lots of texture, maybe in a dark grey to make the inevitable mildew less noticeable, and grit to make it less slippery.Is painting the dripline on a dry afternoon good enough?

I was told by the listing agent that the carpets and some paint would be needed as some of the units have high wear in the kids rooms or are painted random colors in rooms.

Hard money lenders generally want you to have skin in the game.