Got rid of the unsightly hole in the goods shed floor (why did Peco put it there?) and painted it:
Added walls, windows, etc. and painted all with spray paint, then thinner, then more spray paint, and more thinner. Then I hit it all with washes of black acrylic, and followed up with dry-brushed black and white acrylics:
As an afterthought, I painted the interior walls with black acrylic. When the roof is on, it gives a nice effect of a dark space. I received some miniature crate-stacks and barrel-stacks, and intend to paint a couple and put them inside so that they are barely visible when peeking through the doors.