Well thanks to @Adam_Sheather, I’ve got this working.
You can install Revit 2017 from https://drive.google.com/file/d/0B8W4_4YXbIt4ek9mSkh6Y0pCVFk/view?usp=sharing (this link will die, go to the Geometry Gym downloads in the future) and I’ve attached a script and image. Look forward to adding more improvements and features in the very near future.
170913 dynamo convert ifc files.dyn (3.5 KB)
