Military stuff I used used white PTFE wire wrap wire, and for added pain and reliability they also soldered each wire wrap joint and placed a shrink sleeve over them. then they used the chassis as a heatsink by placing some of the TO66 and TO38 package power devices from the power supply board on them. So as not to use different wires for high current they simply doubled the wires on power pins, and used multiple pins for power distribution. Thus at one point there was a star ground for all the boards, with around 80 wire wrap wires coming into a large crimp connector, again crimped, soldered and heatshrunk in white. the good news though was that all this made cleaning the board after one common fault, which cooked the power block into charred epoxy and delivered it via the internal fan all over the inside quite efficiently until the final failure of the 1A mains fuses.
Fun was tracing a broken wire............... Or replacing a faulty wire wrap pin. i did replace some that burnt, was not going to unsolder a 60 pin socket just for one faulty pin or socket that was possible to remove without breaking the housing, and the new pin came out of a new one that was ground down to carefully break it out of the GRP moulding.