Boarding Actions Collum And Collum Wall Floor

I'm trying to make this modular project as wide as I can.
And the measurement are not as my favorite game it's collums, but it's very usefull for my project and the end goal.

I decided to go for 3 different options, to choose from

1. a simple short walls to create the collum. Can also be modular used.

2. a mirror short walls to create a more full collum, but the fit isn't 100% and it ain't modular.

3. a front piece, for a more full collum view. But you can only use this 2x in a collum, instead of the 4x in option 2.