Thank you Bryson for that info. Yes, I knew that the current needed to operate the relays was low.
Adding a fuse is a good idea, I'll do that.
I guess the cleanest / most organized way of getting one wire [ from the ign switch ] through the firewall, to the 5 relays in the said fuse panel, is with a terminal block?
Are you referring to something similar to this?
https://www.amazon.com/Speedway-Mot...857305&sr=8-4&keywords=battery+cable+bulkhead
That'd definitely work, but I don't know that it's necessary. I'd just drill a hole and use a grommet, or even better, find an existing hole and use that. IIRC on a Sami, you can pierce the boot where the factory harness goes through the firewall and fish your wire through there too.