Immersed Boundary Method

Hello again,
I am highly thankful, my final goal would be immersed boundary for FSI application. In fact, I have an immersed boundary code which can be applied for immersed bodies with prescribed motion. What I want to do is develop the code that can be applied for elastic bodies with large deformation. The code is written with finite difference scheme. What I want to do is to couple the current immersed boundary code to CalculiX through preCICE.
I would be thankful if you have any suggestion,
Thank you for your kind attention,