I want to import CAESAR II files to REVIT 3D software. Presumably this could be done by making a generic neutral file from CAESAR II then importing to REVIT. Has anyone done this and if so, how was it done and with what software? How good was the transfer?

I do get CAESAR II models to other 3D via CadWorx, that is AutoCAD. Should try to Inventor Pro, which is in same family as Revit.

If you just need to check pipe routing try exporting Revit model to AutoCAD and import that to CAESAR II 5.1.