That looks great with the curve. What was the build process like?
Well I didn't really know what I was doing so it took 2 attempts (and 3 pours cuz I tried to salvage the first attempt). 1st attempt I was going to try to follow the method shown in this post.
Turns out you have to be really good with concrete to do that and it was obvioulsy not working for me, so mid way through the pour I called an audible and tried to construct a form around the concrete I was already pouring. This wasn't working so I called it quits on pour 1. I thought I could still salvage it by reinforcing the form and pouring on top of what I had poured, but I couldn't properly reinforce the frame because the whole thing was being poured on a tarp and so the 2nd pour failed.
So I went back to the drawing board and just made a form similar to the one in the curbed parking block video above, except mine wasn't upside down cuz I was worried flipping it over would be too hard but that was stupid. If I do it again I'm definitely pouring upside down. The tricky part is having the slappy face sloped (not 90) while also being curved. It required a decent amount of trigonometry and math to figure out - I don't know how detailed you want me to get but basically to make a flat piece of wood into a piece that's bent and sloped to certain specifications, then you have to cut it into a parabolic shape so that when it bends it can be flush with the ground and provide the slope you want. I can go into the math if you wanna know all that. Ultimately my 2nd form still wasn't quite right, the posts that hold up the sides were too far apart still so the form bulged out a bit during the 3rd pour, but it wasn't catastrophic.