Congrats on the success of the project OldandWorn! :drinkup
There is nothing like the sense of satisfaction finishing a long, tough job.
I would take some topsoil and backfill around the concrete pad to cover the stone up and finish out the grade. That's what we do around transclosures, leave the soil a couple of inches below the top of the concrete.
Scrub I don't know what material OldandWorn's transclosures are made of but in my area the power co. has switched from concrete bases to plastic bases and then set a metal transclosure on top. They used to use concrete pads but did away with them a few years ago. In my area we don't really have to worry about grass/forest fires, rains too damn much.