Finally got my connectors up! I spotwelded them with a TIG, but I'm gonna have a friend do the actual welding for me, don't trust myself. I practided a lot of TIG welding, I can make nice welds while sitting in a good position at a table, but once under the car it became very difficult, I realize it takes a lot of experience to make it nice with a TIG. Good thing is that my floor boards seems to be in good condition.