I have been using this app now for about 1 week and have used it to design my own Railset for 3" wide 2 lane slot car track - primarily for a layout involing slot car and HO scale train. The Railset editor takes a bit to learn but once I did it was easy to use. I would like to see multiple layers. I would have preferred a coordinate system for polygons that has +x,+y coordinates above the zero line instead of below - but that is easy enough to adjust for. I would like to see the ability to have a My Inventory Qty for any given part along with qty of parts required with a shoping list of the difference. I will be submitting my railset to the developer's website for posting - I decided that even though I have only Tyco track to make it more generic and include AFX, MM, and Life-Like parts as well. the incomplete layout that I am working on can be viewed at: http://homepage.mac.com/mattwolanski/SlotCarTrack.jpg