Changing Margin and Column Box

[BW]

I have a lengthy "Changing Margin" document that uses the changing_margin.rb example code to create inner/outer margins. It works great until I come to pages where I need to include a column_box. The column box (which will span multiple pages) always starts at the same coordinates instead of following the page margins.

Is there a way to get the column_box to follow the same margin rules as defined for the rest of the document?

Changing Margin example... https://gist.github.com/bradediger/1452402

I greatly appreciate any advice on how to resolve this or if there are suggestions on an alternate approach. Due to timelines, I am looking to remove the margins from Prawn and then import into InDesign to apply the inner/outer margins for the short term but would love for that to be unnecessary.