Indeed. These type of mega projects take time to complete.
The troubles with the unions alone could cause the whole mess to drag on for a thousand years.
"I'm thinking this Slate Gray color for the Dyson sphere is sort of dull. Is it too late to go with the Sunrise Beige color?"
*sigh* "We can do that, but it will be extra. I'll have to get my painter back here. That, and you're looking at two coats to cover the gray. Say about 42,000,000,000,000 gallons of the Sunset Beige".
"Surise Beige."
"Sunrise, Sunset. It's gonna' cause a delay."
Hah!! Unions would be the least of their worries -- Just imagine the Environmental Impact Report filing that would be required. :=)