With later game hover units, I don't really think there are problems with terrain. That said, there is a reason why I made the GyroLEV. Autogyro craft is sort of the extension of Helicopters and I felt it made a lot of sense for Purity/Supremacy. Now that I've got the bulk of the units done and that we have Rising Tide, I'd like to try come up with a few more ideas for aquatic units (but only 1 or 2) since we do have a decent number of hover units. The Supremacy/Harmony "Tenaxodon" I'm working on was conceived as an amphibious unit. But at the moment I think I'd struggle to come up with a feasible list for unique units. I'm very much open to suggestions. Also I'd like to hear what you think about the current units as well as any suggestions you may have on the Explorer upgrades.