There are many reasons why the owner of a flying platform would require a deeper insight into the structural behaviour of the platform. Some of the reasons can be, extension of product life, predictive maintenance, changes to the platform, flying outside the flight envelope, damage, and other ways of operation outside the prescribed operational boundaries. Manufacturers are often hesitant to share models and other tools that were used to analyse the platform in the design and production phase. This research investigates ways to develop low fidelity models of existing flying platforms to perform calculations and analyses. This research attempts to create two different models of a Cessna 550s aeroplane. The two models have different fidelity levels. One is a models based on beam elements and the other is a Finite Element Model with 3D shell elements. Both models are based on public data of the platform. To calibrate, verify and validate the models a two part approach is proposed. The models are validated using a 3D scan of the outside of the plane in combination with other public data about the platform. Calibration and validation of the models is done using data from a Ground Vibration Test (GVT) that was performed many years ago. The research can conclude that it is indeed possible to produce a low fidelity model of a platform using public data. The research demonstrates that a calibrated low fidelity model can reproduce the results of measurements with reasonable accuracy, highlighting the potential of this approach for analysing existing aircraft with unknown or unknown designs.