L shaped bar

so, I'm ready to pour the new floor after a 10inch dig and 6 inches of drainage rock applied. I've done this once before and was satisfied with the result and know I will be again. Not a pro job but very servicable. Let me know if I'm missing anything, The cement will be wheel barrowed in from a window to the 20x20 foot room and dumped, I figure 3 guys with wheel barrows should do it in 1 hr. I could be convince to hire a pump truck. once that is done we will level it off as best as we can. we'll be wading in the cement and I'll make up some push sticks(6foot 2x4 on a handle to help leveling. I will have the wall maked with a lazer level but we'll eye ball it from the wall. we'll let it set for a while, maybe an hr or 2 then put down brds to walk on and trowel from the furthest point out back to the door to push the stones down and the water up, once that is satisfactory were done. Am I missing anything, Any advice. The cement contractor seemed to think that our plan was solid.

I've framed out my exterior basement walls with select grade 2" x 4"s, held 1" from the concrete block walls. I've taken great care to keep everything plumb and square. Now that I'm almost done, though, when I place a straightedge across the face of the studs, I notice that many of them sit out farther than others. I don't want a ripple effect when I install the drywall, so what's the best way to deal with this - shims? I hadn't planned to use fire blocking - is this maybe the answer? Any advice is appreciated.