I need some advice for a concrete slab.

[SanPatHogger]

Got a price for a 40x64 metal building I want. Found a local guy who sounds like he knows what he's doing. It's going to have a 15,000 pound car/truck lift installed. Where the lift is going has to be 4 inches thick, steel reinforced and 3,500 psi.
I was quoted some crazy numbers up to $45,000 for a slab.
40x64 building, so I should probably go 41x65 to have a little wiggle room?
The local guy said to have an extra 6 inchs around the edge.
What size and how much rebar?
He said I'll need to rent a skid steer to clear and level the ground, but I was thinking about a mini excavator so I could dig out a little deeper for the lift area and the perimeter.
Do I need to do anything to the ground before pouring? I saw a video that said to wet it down with water before pouring to keep the concrete from drying too fast.
I am in South Texas, the ground is mostly clay and sand and shifts quite a bit.
Anything I am missing?
Just for reference I have 1 bow kill and I have not bench pressed anything in a long time.

 

[Milf Dots]

Unless you have a good looking, single female relative between 29-60, I don't have any time for this...

 

[lonegunman762x51]

Call the local concrete company and price the materials. Do the math yourself. 33 or 34 yards of concrete at $250 a yard is about 8,500 for concrete. Most shop floors have minimal steel. Figure rebar and 6 inches or more in trenchs for the base of the lift.

I see about $25k for the concrete work at the high end with that price for mud. These days all contractors are fucking people because California scumbags are moving everywhere and paying buttfuck prices for anything.

If you can do cash and side job it that might help.