[DrillBIT]

Just went through the spec list for Mach at TV Asahi.

For some reason the Next System for Mach seems to be a complete different design approach than Drive. The power source and Gravity Drive system is build inside the chest piece rather than the belt. It is more like an external add-on for another dedicated user rather than Gou.
It says the spec is to much for Gou to handle, and that is the reason for the time limiter.
It also says the time limit could be extended by further modification and extensive user training. But I guess at the end Gou may not be able to handle the system due to physical limitation.
Seems like the system is designed for Cyberoid 000 in the first place. More like an add-on protectors for it.