What I did when wiring my layout was to take the largest screw terminal block I could find, and cut into 12 sections, leaving the plastic housing intact on each screw terminal. I threaded the bus wire through the screw terminal sections, and stripped the insulation for approx. 30mm where I wanted to connect the feeder wire to the screw terminal.
This allows for easy removal or addition of extra feeder wires if needed, without the PITA associated of trying to solder upside down when doing maintenance work.
Steve