Hey,
I've done this to my s14a (basically the same setup..).
I relocated the fuse box to the glove box as I wanted to keep my airbag. I never figured out a neat way to fix it, so I just locked it shut so a passenger doesn't open it
I rebuilt the OS light loom as it was too short and relocated both light looms through the ecu harness grommet on the passenger side and ran them down the chassis rail. I also extended a couple of the gearbox looms and put them through a grommet near the gearbox.
I tidied up the earths, grouped them where possible... I now no longer have any wiring going through the OS arch.
I relocated the battery at the same time, and I also have no ABS or aircon so you may have to do a little bit more than above as I stripped all this out my loom to simplify it
Its a chunky job, and I'd recommend doing it all in one go (as its easy to get lost!). But so worth it.