Dear @Heike.vonWaaden,
I’m not sure what you mean by “an automatic way to create a jacket model”.
Regarding your second question, the ability to visualize the offshore support structure was broken in OpenFAST v2.6 per the following issue: Visualizing Offshore Support Structures · Issue #776 · OpenFAST/openfast · GitHub. However, this was partly resolved in OpenFAST v3.5.1 through the following pull request: Visualization of HydroDyn Morison mesh and MoorDyn lines by andrew-platt · Pull Request #1768 · OpenFAST/openfast · GitHub. So, upgrading to the newest version of OpenFAST should solve the visualization problem.
Best regards,