MAC users: I uploaded two different builds. One is the normal 2016.13 release. If you aren't the adventurous type, use that one. The other, the 2016.13-NewLayout file, contains a highly experimental, no-where-near finished, likely crash prone, replacement for the Layout panel. I mostly just want to get a few folks looking at it to see if it's heading in a good direction. Right now, creating/deleting models and managing the "Part of my display" setting needs to be done the "old way" (Model dialogs). However, once created, there are settings right on the panel for everything else. Plus, there are some new settings for the arches and trees. (see if you can find them.. ;-) )