Your layout is shaping up nicely. I like all the different scenic elements. Thanks for sharing.
It is a challenge to build a larger layout, you need to keep the motivation at a high level to get things done within a reasonable amount of time. It is nice that your daughter and son also enjoy the hobby enough to help out Dad. By doing different tasks like you demonstrated, I think it keeps the overall build fresh and creative.
I am in year (3) of my new layout. It is about 750 square feet on two levels. At 63, I hope to hit the finish line before retirement! Thank goodness my wife knows how to use a chop saw and drive wood screws.
Keep up the good work.
Donald