Just noticed I have the Peltier power rail wrong. Yes on the PCB image they are indeed joined. Sorry missed by ...that much!
Faddy made a hole in his case rear and sealed this with something that looked like silastic. These wires then ran to his breakout/peltier control box. It depends upon the material used. Something like a metal set like JB weld/Devcon would be ok but I suspect they wouldn't stick to some wire insulation.
The Altronics sealed D subs look just like the digikey versions or copies there of. I'd like to see their data sheet on them.