I have an opportunity to build a new HO scale layout, basically starting over from scratch. I'd like to build it around-the-walls, but the cost of "traditional" benchwork is outside of the available budget, so I'm considering using "L" brackets attached to the walls every 18" to 24" to support 24" wide, 2" thick blue foam board. My questions are: 1. How can I attach the foam to the brackets so it doesn't slide off onto the floor? ;-) 2. How far apart should the brackets be to support the foam board (and trains, track, scenery, etc.)? 3. Any recommendations about make or model of brackets? 4. How can I join the foam board segments end-to-end? Please feel free to ask me any questions for clarification, via either public post or private message. Thanks in advance for your ideas, experiences, etc.