I only do electronics on £100k cars usually so we don't see much mil spec
Fair point the last battery we bought for a satellite cost a good bit more than that, and it fit in your hand! If your only dealing with cheap motors..
Just kidding, its really nice to see someone raising the bar with wiring, its so often overlooked in builds, or lashed up and mummified in tesa tape!
Mil-spec is usually more about the exacting way the wire sits in the crimp (space rated stuff is a littke different as is uk and us specs) but it's like specifying the gap between the cut insulation and crimp as 0.2mm-0.5xd (d being wire diameter) and 0.2-0.3mm of wire beyond the end of the crimp etc. Its damn hard work to get right and the tooling cost is insane (£800 for a set of wire strippers, and they need recalibrating £50 when you set them to a diffferent size wire or every 6 months, so you often have a few sets).
Your looms do look really good though.