I've recently become aware of Soldering Paste Flux for electrical work. A small dab is applied to the joint prior to soldering to enhance solder...
SOLDER ALL THE JOINTERS!
pre-tinned wire is coated with flux, held in place with a small alligator clip then soldered for only a second or two.
Soldered track to copper PCB/plate thingies. Join between Modules 4 (yard) and 5 (ladder) shown.
Soldered track to copper PCB/plate thingies. Join between Modules 3 and 4 (both yard) shown. Track is shown soldered but not cut. Manual razor...
Soldered track to copper PCB/plate thingies. Join between Modules 3 and 4 (both yard) shown. Cut track using Dremel - note safety equipment!...
Soldered track to copper PCB/plate thingies. Join between Modules 2 (ladder) and 3 (yard) shown. A good soldering iron helps - this one is also...