Creating Murals Using InDesign CS6

We often use InDesign for creating seamless multi-panel murals, i.e. a 6 panel flow wall where each panel could be considered a 'tile' (like tiles in a RIP), suppose 40" x 96" each done at 25% scale. 

The problem arises when using a spread where either pages are different sizes or when resizing all pages, viz: either an undesirable gap or overlap is created between panels. 

We prefer using InDesign for this because there may fifty=plus logos or other images placed thereupon, and using Illustrator would become tedious.

What solutions are there?

Thanks!