Good design and planning is the only place to start. The client and builder can relax in the knowledge that the chances of error are greatly reduced in what is a fairly complicated construction. The arches themselves were made of laminated ply which hold the whole thing together.
This is what the customer knew he was getting for the money and how it will look in the venue.
Minor changes are made by the customer. One arch becomes a circle. The finished article goes into the venue on a Sunday and Monday with minimal disruption to business. Everyone's on the same page and there's no shouting