I got the 7/16" connectors today for the stackbox and hopefully tomorrow I will recieve the vacuum relays. Now I need to find a box so I can start building it. The 7/16" connectors are a bit strange though and might need to be modified a bit for it to work, hopefully.
Also I did visit EISCAT radar facility in Kiruna for research in the beginnig of this week and check this link out, especially the movies when they turn the big dish around. The diameter of that thing is 32m!