My phone lost a few of the measurement tags yesterday, but this is a rough guide. Not drawn to scale.
The reasoning behind the suggestion on the plan that the stage / seating be on the right as you enter is about the acoustics: any sound playback, live music, speech events etc. would stand the best chance of being intelligble in that area.

Here’s a quick panorama … taken from bottom left of plan, standing roughly beside the bottom left pillar.