For those interested, attached is a document describing the 3 different modelling modes within IRONCAD (as listed below), and how these relate to the common modelling approaches used for 3D modelling (that is, "Direct Face Modelling" and "Feature Based Modelling"). 1. Innovative Part Modelling - Offers Greater Freedom (best suited for simple single bodied models) 2. Structured Part Modelling - Offers Greater Functionality (best suited for complex multi-bodied models) 3. Sheet Meta