Here’s one of the females (well, this one is Mrs LHS!) with nesting material…

And here she is, flying to the Arborvitae to add to the furnishings: The "stereo" nesting process is going well... Here's the left-hand-side one: and here's the right-hand-side one:

I can say that the operative word for House Finch Houses in our house this month, is “March”…marching, that is, left-right, left-right!