worthing3104

It is/will be Your Layout.  I only offer information based upon experience, my own and other Large scale & O scale enthusiests who run trains outdoors. 

Your choice to run indoor track, outdoors, IMHO, is a mistake and you will be replacing it with track made to be used outdoors. You need to consider UV Stability & corrosion of the track & connections, regardless whether you live in Las Vegas or Death Valley, unless you plan on taking the track up and putting it back out every time you chose to run your train.

But in the end it will be your layout and whatever you choose to do, is what it's about in the long run.

Happy Rails!
dave