First things first: let's start to see if the relays are properly working...

For the purpose I built a little tester rig:
Result? Bad. Out of the 62 relays I've found that 13 of them work unreliably and 3 not working properly at all. Partly good news is anyway that I've 46 remaining that seems working, let's see.

In the meantime I built also a frame to keep the relays of the mounted computer. Here the last assembly step: