Minimo is being developed by Doug Turner and he has evidence of Mnimo running on the 770 here. MANaOS appears to be embedded Mozilla (Gecko?) which is not the same as Minimo, I suspect "true" Minimo is (or will be) better tuned for the smaller devices.
It uses a almost default Minimo build, except for the disabling XUL (--disable-xul specified on the mozconfig file (mozilla/minimo/config/mozconfig/linux_x86) and a simple extension for zoomming based on the colorzilla algorithm (this component is built in JS and suchs on a real device).