That's supposed to be a tucked dash harness? I mean, I get that you de-loomed it and zip tied it, and I assume you cut some un-needed wiring out, but damn.
That still looks like a whole pile of stuff I don't want/need under a dash.
I'd also look into relay holders that can be mounted to a plate (or that heater box you still have) rather than having all your relays free-hanging and moving.
This is a custom fusebox/relay setup that I did for a SR20'd Datsun 510, retained all OEM functionality (with OEM switches, ugh) in addition to an alarm and 9 gauges.
Another one, you can see the three sections of loom that converge to cross the dash (engine harness, front chassis harness, rear chassis harness) and the back of the bulkhead connectors here
Are you still using the SMJ and driver's side interior fusebox?