Our customers need a straightforward way to configure complex industrial equipment and get a quote instantly. Create an iOS app with a step-by-step flow where users pick a base model, engine type, and accessories. As they make choices, later steps should only show compatible options using rules from our API, and a running total should update in real time. When they finish, generate a professional PDF quote with the full configuration and customer details, then send it to our sales system. Please build it in Objective-C with UIKit, following an MVC structure.