I'll "third" the industrial rigger suggestion. I have been talking to "J Henry Holland" in Norfolk, VA. The wire and terminals are less expensive than I've found most places. They will fab the wires or, get this, I can fab them and, for $30 or so each, they will proof test them for me. That way I can know I did them right and sleep more soundly at night. I can also get the mill certs on the wire so there is no doubt as to it's origin.
I've been looking to use Esmet's Electroline terminal fittings for my rig. These are mil spec fittings and come with full product certs. Has anyone ever used them?
BTW, most Ind. riggers (at least those near ports
or naval bases) also sell; harnesses, yacht line, 3-strand, Spectra, Amsteel, toggles, pelican hooks, tools, chain, etc. They also do splices and will pre-stretch synthetic ropes.
Now, if I could just convince myself that EIPS would look as good as SS I could really save some $$.
The only problem with the spelter sockets for a DIY'er is that molten metal will just ruin a fiberglass cockpit