Cool little video.
The worst part that I have found is finding the part numbers for the actual connectors. If you manage to find the connector part numbers, it then is difficult to find the manufacturer for the parts. If you find the manufacturer then you have to see if they have them, which in most cases for me is no. So then if you are lucky enough to get them to do a production run it is usually 200 of each one, but price is a couple dollars each. The pins for the connectors are so hard to find, usually about $0.05-0.10 per and a minimum order quantity in the mid thousands. (This is all speaking for a Ford application).
There are some aftermarket companies that stock connectors and pins, but they want usually between $20-$100 for each connector, and $0.30-$0.50 cents per pin.
I know in my searches for Ford electrical stuff, over the last year or so. I contacted like six or seven manufacturers that at one point made stuff for Ford, Finding electrical pins/connectors has got to be the most frustrating part of a vehicle project. I see GM Weather Pack and Dodge terminals/connectors all day long for good prices. Ford on the other hand has control over their pins and connectors and one must get a release to be able to purchase them.
I've always wanted to see how the factory manufacturers a full vehicle wiring harness with 104 wires or better. I know Delphi has an automated wire harness machine. Sure would be cool to get a hold of the original spec/engineering drawings for various harnesses.