Simple Ribbed structure

Hey there!
I’m trying to create a rib tunnel structure (with horizontal and vertical ribs), similar to this:

But I don’t know how to make the ribs. Followed a tutorial and created this structure:

I don’t know how to proceed from now on. Any idea?
Thanks in advance.

Loads of waffle tutorials on Youtube.
Perhaps follow this one which shows something similar:

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Just a try; always there is a better way (18.5 KB)

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Thank you very much!