The core issue in large scale construction projects is the power that main contractors have over payment terms. They can insist on 90 days credit. That's a disincentive for a large segment of the market, who may well be the best qualified, to submit quotes in the first place, but it kind of spurs subcontractors who take the bait, to complete their billable work promptly.

If those bastards were neutered, and the architects were held more responsible for their errors, I think you would find the rest of the people in your thesis would take care of themselves. At least that's my experience of efficient and easy going contracts.

You don't need instant payment to be incentivised to give a job your all, you just need the assurance that your payment is assured at the end of the week,so you can pay weekly shopping bill, or pay your workforce so they can go weekly shopping etc.

Suppliers currently don't require instant payments, or if they do they don't give credit. That they give credit obviously adds to the cost of what they sell, which could do with addressing.

The lightning payment would make the act of being paid simple and frictionless. But I would think as long as terms are honoured, and of a sensible timescale ie not 90 days, which is forcing sub contractors with weekly or monthly bills to need a loan to cover zero income for 90 days, which is an overhead that goes into their pricing, that would be a revolution in itself.

Maybe lightning first target is to streamline payments between the manufacturers of construction materials. A bit easier to nail down, all things being equal, compared to the organic mass thst is a construction site. I'm rambling now :)