Mine is all hand laid code 125 with all the switches built in place. Good music and it's almost a zen thing. I also made maybe 80-85% of my own ties.
Time may be an issue, but cost is another issue. Also, hand laying track actually goes a lot faster than you might think and building the switches in place gives you the freedom to follow whatever track plan you want vs. that being constrained by the limitations of commercial track.
