Some builds are simply too big to just launch into them without a bit of careful planning.
That's where scale models come in handy.
We keep a few standard pieces and parts around that we can use to test out some of our wild and crazy ideas.
It's much simpler to use just our fingers and a few spare moments to try a concept out. It sure beats slinging around a few 150 pound timbers only to find that the idea would not hold water.
So we keep a stock of small 1/12th scale parts including some model railroad track that we can use to trial our dreams and dismiss our nightmares.
It just takes a little careful planning.