I bet all the neighbours tongues are wagging behind your back saying how you've ruined a perfectly good lawn ???
Remember he who laughs last, laughs longest. (and loudest)
The last photo shows that there is quite a bit of unevenness, especially near the sides, is that correct or is it just the photo ?
Must admit I would've preferred to have seen sand being used which would've been far easier to work with, but hey it is what it is.
Cheers,
BB.