Sandy is correct, there was an article in the past couple of years I think..wish I could remember. It was that or online on the net I read the same thing. If memory serves me correctly, the author used the BTZ tubes, just took the caps off and rolled them in each tray. Can't remember if there was an impact on developing times or not.
I agree Sandy, my hat is off to those that can tray process without damage - since I just started processing 4x5 have not done that much (25 or so sheets), tried a Beseler 8x10 rotary tank with so, so results (could not get a good seal) - Don's home made tubes looked like a possible choice, but this may ticket - cheaper than a slosh tray I was considering.
Sandy, don't you think Don's screen would be an asset with this type of system?