Issues with hollow'd BSP

Hi guys!

I’m trying to blockmesh something in the editor and one of my issues is the fact hollow’d brushes that were extruded are showing some issues like outer walls from the extruded sections don’t the way they should.

Any clues?

Here is a video UE4 issues with BSP hollow'd brushes - YouTube

An alternative path could be edit the brush first then hollow it later, but every time I follow this strategy the brushes reverts to the original shape.

Any help will be appreciated!

Bump

I need a little hand here