This reminds me a bit of Multiwire, a somewhat unusual circuit manufacturing technique from the 1980s. A machine laid down wires and then encased them in resin. The best info I can find is this slide deck:

https://www.swtest.org/swtw_library/2013proc/PDF/SWTW13-22.p...

I believe this technique was used in the Three Rivers PERQ computers. Here is an image of one of their PCBs https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg...