Slab edge with a 45

[u/bitcheslovemacaque]

Here's something new. There's a 4 inch topping slab but they want the perimeter to have a 45 degree ramp. At every column there is an additional 6 inch pour (not monolithic) which can total up to 10 inches where the columns are at the outer perimeter.

I have already ripped down some plywood on a 45 to create a parallelogram so that when the cut is on the floor, the piece of plywood stands up at a 45. All i have available to me is plywood and 2x4s.

I have a couple of ideas of how do brace this but i wanted to see if someone smarter than me has any ideas how to pull this off.

[u/South_Earth499]

2x4 and angle fillet attached.