JPV, if you make your layout modular, it would make changing up sections a lot easier! I plan to build the layout in sections.
The first stage of the build is what I have now - the three scenic boards and the (in progress) traversor board.
Stage two would be the Autoparts and TOFC ramp module, and 90 degrees of the curve, which the traversor would then be moved to the end of.
Stage three would add in the other 90 degree curve, and the traversor would move again.
Stage four would be the coal dealer and depot boards, completing the build. The traversor would then move again. 
Modular layouts make things much more achievable, I think. And if you don't like how one part turns out, you take it down and build a replacement instead.
