Man, you've been busy! My back aches just looking at the pile...
Stacking firewood on pallets really seems to work well for keeping the bottom of the stack dry. Those 12 foot pallets look like they're really useful, but I'm guessing that they're a pain in the back to move around.
The design is SOOOO much better now. The pallets are not light by any means and they are super unweildy. I have the pile of pallets on the other side of the garden so it required carrying each on my back for a ways then sliding it on its edge the rest of the way. Luckily I only had to move the 2 pallets, for now. If my wood supply outgrows my space I may have to put another out in the yard somewhere to stack on.