Thanks for the response. I was afraid that it might be the case that the software will not allow me to model in 2D. The geometry represents an endothelial cell in a parallel plate flow chamber. The reinforcements represent cytoskeletal structures that are crucial to the question that the model is investigating. They are very thin compared to the other structures (about 1000x thinner than the height of the cell in this model) so I was hoping to justify the use of 2D beams/cables for this model on that ground.

Unfortunately, the complexity of the 3D shape has led to never-ending convergence issues over the past year of work on this model, so I was trying to simplify it into a 2D approximation so that I would at least have some kind of limited result.