I think I have to stick with Gatorboard. That Gfoam is expensive on that site, and perhaps overkill for this project. Regardless, thanks!
Its about $20 a sheet of 4x8 for gatorboard. I know some folks get it for much less. Was hoping for such a source.
I'm no no way a "master printer", but I can get a file looking very nice even upsizing to a 24x36. But this take time, patients and practice, in particular with an inferior file.
Simply put, the pieces are not going to be that high quality level to put on Gfoam. There is a lot to cover, and they need it fast, under budget, and its indoors expecting for a 10 year or so durability.