Tabs and slots

HI, I recently signed a long term contract with a large scale outdoor sculptor who works in SS, Aluminum and Corten Steel. All of her project are cut out of sheet material and then welded together. This requires adding slots and tabs to the designs so they can be assembled correctly.

I am looking for a plug in for Rhino that will help build the tabs and slots. I have attached a Rhino File for reference, and please see https://www.youtube.com/watch?v=07ZYFySIHtE as an example of how Solidworks handle the taskClover ASculpture Build2Complete.3dm (10.5 MB)

Understand what you are doing. I have been doing this manually and it takes a lot of time. Where is this script available?? Also, I have read instructions for installing scripts and have not had much luck.