I'd cut your losses.
in 2 days you could fit focus engine and dash loom with focus clocks, and wire basic lights in for now.
Just cut and twist the wires form focus light to fiesta same light and you use all fiesta plugs.
That was my plan. Brake lights and indicators and go from there.
Then make adjustments to fiesta dash to fit around focus clocks.
not perfect but makes it alot easier, just like a focus car in a fiesta she'll, literally