Our club is 3000 square feet.
The only soldering we do is in control panels. switchmaster turnout motors, and track drops with solid wire.
Every other connection is with either spade lugs or molex connectors (Crimp connectors).
track drops are about 6 inches to a terminal block.
I have several good photos of how we did these if you are interested.
BTW, we have been using this wiring since 1990, with no issues.