After researching both Unity and Unreal Engine 4, I concluded that UE4 would be best to create a UI. I have done a small bit of self-teaching to learn the basics of how the engine works, and have a collection of online tutorials that I can refer back to if needed.
Alongside this, I have also been preparing a flow chart, to provide a step-by-step guide on how the UI will work and how actions are performed. This will probably be made on PowerPoint, both because I know the platform very well and the flow chart does not need to be technically impressive.
Once the flow chart is finished, I’ll post it here and begin work on an interactive UI on UE4.