Box build is where every other capability on our floor comes together. Harnesses we built last week get dressed into the chassis this week. PCBAs go in. Panels close. Then it gets tested against your ATP, and it ships with a documentation package that satisfies your supply chain and your customer.
We work from your drawing package, your BOM, and your test procedure. We don’t sub-contract the integration. Whoever quoted it is on the floor when it ships.