The Gantry framework is a flexible foundation on which a nearly endless amount of different site configurations and layouts can be based. It would be difficult to draw up a single wireframe to truly outline all the possible layouts you can create with Gantry, though we have provided a basic module position layout for our demo Gantry template here:
demo.gantry-framework.org/features/module-positions
This could serve as a basis on which your proposed template can build on. I hope this helps, and will be happy to answer any further questions you might have.
Thank you.
Ryan Matthew Pierson / Technical Writer / Buda, TX USA