I plan on twisting each pair of conductors together until the Y-split when they will become a 4-strand round braid. The heatshrink on the connector end and Y-split, as well as the soldered connections will be enough to hold the twist in place. If for some reason that doesn't work out(but it will), then I can add small pieces of clear heatshrink along the twist.
Pretty much the same way many CIEM cables are made by all the usual names. Just take a look at a few companies that make the cables and you'll get the picture.
Or I could just sleeve the whole thing and not worry about it at all. Though even sleeving I would still do it the same before adding the sleeve. That's just me though.
Basically what Omark12 said.
The Navships will be super cheap, no doubt. I've actually done a recable of some Monoprice 9927s with it just for the lawlz and practice soldering to drivers. I've also used it to practice more difficult braids first. The problem is that it isn't the most comfortable or flexible wire. It's fairly stiff and the insulation is anything but soft. It has a very "wirey" feel to it and memory prone. It just doesn't feel that comfortable over the ear in particular. I think as long as you have something like sleeving, and ear guide, or maybe clear heatshrink around the part that will touch over your ear, it'll be fine. YMMV of course.