Not being able to see my real world scale 3D Model



I’m currently doing a test for an upcoming job.

The idea is that a user can scan a zapcode and then walk down a corridor while things happen on the walls.

I’ve modelled an 8m corridor and imported this into zappar using the “manual/zoom” scale option under the scale tab set to 100%

My issue now is, I can’t actually see my model within the Zapworks work space. I guess its the size of it.

So my question is, how big can a real scale model be before it becomes un-workable?

What is the best approach? World tracking placement?