I use a Marine pole socket for my live wires, too many for battery, it's a post that secures to a flat panel, then has a 6mm stud that you bolt all the terms onto, comes with neat cover and is waterproof as marine, cost was around £6.
For the negative side I used a positive side battery multi connector bit , bent the retaing bracket from sticking up to down now flipped over and it fits on the negative side perfectly, and of course being a mirror image of the positive side one it is factory looking, and free from most scrappies!!
tabetha