Are there any mono-eye Gundams besides the Zeta Zaku?
One of the G Gen games was literally called "Monoeye Gundams" and was all about it. Sisquiede is a cool design.
Other than that there's technically the Gerbera Tetra (used to be a Gundam but then they sold it to zeeks).
Phantom Gundam, which is actually a monoeye masquerading as two-eyed (it's got eye lenses but there's only a Jupiter Empire MS-style monoeye behind them).
Legilis had the standard Vagan slit visor thing for a while but then switched to regular eyes.