Just from looking at the node error of unresolved my first in instinct is to check if the package is installed. I would also check the folder to make sure the dll files have been downloaded. I have an image of the files that should be in this folder. I can upload them to you if they are missing. C:\Users\user.name\AppData\Roaming\Dynamo\Dynamo Revit\1.2\packages\Etabs Excel to Revit\bin
I build Dynamo/Add-ins here at Skidmore Owing and Merrill (SOM) for project specific reasons and then if I find them useful I publish them. I haven’t had the chance to build shell items or pier elements. One beautiful part Etabs is that everything you need to build Revit elements is available.
The bad part of Etabs is that the geometry isn’t always 100% accurate or the way which an engineer models consistant. Engineers will destroy geometry in Etabs killing our connection between Etabs ID and Revit ID. I started using XYZ point with a tolerance and matching start and end points of items to update and change Revit elements types and load new types. Unfortunately, that part of the project is built in an add-in which is project specific. All the source code is online on my git if you want to take a look at it.
I think one thing we are looking at is post tension and concrete in my next project, therefore, if something useful is made I will publish it.