To answer your question Dave, Yes, I used particle board. 5/8" to be exact. since I was going in a straight line, it didn't matter much, and was a lot cheaper than MDF. The router still burns/melts the bonding agent and seals the groove pretty good.
Now for the good stuff! I made some progress on the strip today. I have even made test runs on both lanes.
I can only say, that having that much fun with only the first section done, tells me I'm in for a good time at 48' ! Here's what I have done so far. The drivers stations are wired, and waiting on controller holders. I used a trick I saw on You tube, where a guy used romex wire to make the loops that hook up the controllers. its a neat idea, and is cheap also. two holes for each clip, and you run the wire back through and bend it over.
I also got the side rails up, and routed a center divider to keep the launching cars apart.
I am using a PM 15 amp power supply, and PM controllers for now.
Still a good ways to go, but its coming together nicely enough that I am happy with it.
Hope ya'all like it!