Can anyone identify this equipment?

Cool dude, but, that speaker placement...well, most of the speakers in those days were rough anyways (looks like he gave up, understandably).

Plant’s pose and attire look like those of a teenage girl.

Jirin4, you may be right. Thanks. Same goes for boxcarman, thanks. 

I really doubt that’s even his system.  It’s probably a publicity picture or something for a magazine or ad or something. It would be interesting to know.  It just doesn’t look like the kind of house or style he would live in back then.  At least not from all the old pictures I’ve seen from that era.  Would be in to know where that picture came from.

Plant’s pose and attire look like those of a teenage girl.

I think this was taken during the short-lived Led Zeppelin bobby soxer phase.

You know, they'd giggle about boys and do each other's hair...