Recently i was spending time with my layout plan(after having put it away for some time due to other commitments) and trying to determine operations,scenery and the myriad of other items that go along with the planning stage,Then , i had an epiphany. Break it down. Draw to scale seperate area's and plan these area's for scenic affect,buildings and operations goals. On paper this can then be done on a much larger scale. If you develop the main elements of your track plan, (main line,Hidden staging and main yard area) All other area's can be seperates into manegable segments(similar to John Armstrongs Squares or the LDsigs Dominoes) yet based on the entire area you want to devote to a particular whistle stop, industry or city. As each area is laid out the track portion can then be Transfered to your main trackplan knowing that you have allowed enough room for each feature to not only fit,but function properly in your scheme. Wow, what a concept and one that woks(at least it did for me ) I also found an obscure problem with my mainline routing that i may not have caught until it was too late.This alone saved me one major headache and fortunatly i was able to rectify the situation quite easily even though my mainline track installation was nearly completed. So, put your trackplan into magnify mode,develop thoroughly a small segment then move to the next.In this manner you will not only have a very complete idea of how things will fit,work and operate,you may even find you have improved on your initial idea simply due to viewing the Tree rather than the Forest !!