Front-end hybrid designs for the CMS Phase-2 Upgrade towards the production phase

<!--HTML-->Sixteen thousand 2S front-end hybrids and twelve thousand PS front-end hybrids will be produced for the CMS Tracker Phase-2 Upgrade. The hybrids consist of flip-chips, passives and mechanical components mounted on a flexible substrate, laminated onto carbon-fibre stiffeners with thermal expansion compensators. In the prototyping phase, several critical issues have been solved to manufacture these complex circuits. Final designs are now reaching readiness for the full-scale production. High-density circuit design practices, lessons learned during the prototyping phase and different improvements for manufacturability will be presented in this contribution.