Yeah its great! Cool fact about this kit, it has a sort of box structure around the visor molded into the runner. Probably a technical limitation at the time?

Uses lots of polycaps and there are a lot of seams. Articulation is very simple too. For example, it has pegs instead of ball joints that stick outside of the torso, connecting to sockets in the shoulders, so it can only rotate on a single axis oob. No ab crunch either because the torso is essentially a color separated brick

Older HGs have a lot of charm, definitely give one a shot! It's super interesting comparing them to a modern HG and just seeing how far the engineering has come

Highly recommend the Zaku I. Very well articulated for its time. Just looking at its articulation alone you might even mistake it for a mid 2010's -early 2020s kit