Got the plumbing trench filled.

I used plywood forms with grade stakes to make straight edges in the footer trenches where the plumbing trench crossed them.

Pack in some dirt, get it wet, let it cure. The tops of those edges are not completely filled in, but I can come back later and fill them once the footers are poured and the stem wall is laid. For now I just need a good edge high enough to pour eight inches of concrete.

Tomorrow I should be able to start laying down rebar for the footers.