I bought two 4*4 foot plywood baseboards, which will sit one two lots of 2*4 foot tables. I havent put the track on yet because I wanted to sort the dowels out first, while they were left leaning against the wall they warped about an inch in the middle, and not in the direction of gravity. Someone I know said it would be because the initial water vapour left the wood because of the way they were stacked (can't really be changed). I found a way to correct it but I need to find a way to prevent this happening once i get the track on it because I will be storing it in the example same place. I could nail down some support beams but this would be a last resort as it would make them heavier (my layout is pop up / pop down) when carrying them. Does anyone have any good ideas/ experience in this area? Also the room they are stored is mostly cool in the summer, cold in the winter but not damp.