Bill, thank you.
Yes, use on a Christmas display is exactly why my wife brought the other stuff home. It was 'okay' in that instance, basically because it was white. 
It was tough to reuse even for that. I did wrap in plastic and stack 4 or 5 unused panels up in the attic, since it is cut for home insulation. It will probably still be there when we get our daughter to clean out the attic when I can't crawl around in there anymore. 
How I proceed with the scenery sections is a work in progress. First of all, I am not planning on making extra sections to change out. The purpose is to pretty much finish each and only remove it if I need to get at any wiring. Making a hand hold that isn't obvious to the viewer is an issue that stands out. If there were going to be lots of buildings, I could just hide handles under removable buildings. With the intent of at least one section being a wilderness area makes for a problem. I could put in a couple of small trackside structures or a rock section that would hide handles. For now, I am able to reach under the layout and push up on the Masonite bottom of each removable section to pop it up and then grab the front of the section. We will see how things progress. The only time I ever did this before was to cover a turnback loop with a tunnel. In that case I just lifted the whole top off, which was no challenge at all.
Another problem is that I have the small river running from removable section to section. Hiding seams with foliage, rock, or buildings isn't as hard as a seam across water. I could make the river attached to the layout, but it is in the rear of the sections. Also, there is one wire drop from the track to the #14 wire to the panel along the rear track. If I made the river fixed to the layout, I would have to move or lengthen the drop. We will see how all that progresses as well.
In all, I find the above challenges more interesting and fun than the challenges we went through wiring all this up.
