How to create ribbed wall or ribbing

I am needing to create ribbing, but with the same wall thickness. Not only that, but I need three walls of ribbing to come together - again consistently. So if you looked at it orthographically from the top it would look like a square, just missing one side. Hopefully this makes sense… So first I need to know how to even create the ribbing, and then how to connect the walls nicely. I really truly appreciate any help!

Hello- can you post a file with the object that is to get the ribs and showing how you want them?

-Pascal

This is part of the sketch of what I’m modeling. It is for an Internship, so I cannot show everything. Hopefully this link works for you, and you can see the image. Thank you so much! Ribbed Sketch

I see- try making an array of boxes (as the ribs) to BooleanUnion with the base object. Simple example attached Ribs.3dm(558.2 KB)

-Pascal