I more or less just built as I went but here are some quick notes/details. The back panel is not shown but it’s just 1/4” cheapo particle board stuff. I rabbited all the edges of the rails and the backs of the sides with a table saw so modules and back panel flush up to the case, but this isn’t necessary. Also used a “pocket jig” to hide screws/hardware. Also not necessary but it looks better:
