How would you design a mobile workflow for window and door manufacturers?

Hi everyone, I’m exploring the UX/UI design of a mobile workflow for PVC/uPVC and aluminium window and door manufacturers. These users often need to visit a customer, take measurements, sketch a window or door, calculate materials and costs, manage the project, and prepare a quote — sometimes directly on-site from a phone or tablet. I’m trying to understand how this kind of professional workflow should be designed so it feels simple, fast, and practical for non-technical users. Some questions I’m thinking a