Thanks Warren. Yeah - sorry it was not done when you came over but hey - now you have an excuse to stop by if you are around ATL again!
I think the new Transformers will fit the bill for something loud.
Thanks Cinema Mad. I used an aluminum U track down the left/right side with a guide block. I think if I were doing it over - I would use something like your design shows because that is a great idea. I have lots of ideas for how to improve this system and plan on uploading a few more detailed pics today of the final system.