Alas, I completed my coal bin. Thanks for all the input from my fellow coal burners. A HUGE thank you to VigIIPeaBurner for walking me through my build by providing many pictures and answering many questions. The finished dimensions are 8x5x5 with the rear wall being 6 feet high. It should hold about 5 tons. I burn about 4 tons of nut and I wanted a bin to hold at least a seasons worth of coal with a bit of wiggle room. All framework is 12" oc, except the door slat opening is 2 feet wide. I used 5/4 deck boards on the floor to help with drainage. The removable slates are 5/4 deck boards as well. I used metal studs as a track for the slats. I painted them black, figured they would rust from the wet coal. I thought I would be saving some money from last years plans, but that went out the window when I chose cedar planks for the siding...ouch that stuff is expensive. Everything ran me just over 1K. I know, painful...but with over $100 price difference between bagged and bulk it is worth it. My options were painted T1-11 (which I feel I would still need plywood underneath for structural support), plywood and vinyl or rough cut cedar planks. I really liked the look of the cedar and don't need to do anything to it. I left a 5" tall opening in the front to shovel coal from. I constructed the roof frame out of 2x2's and mounted corrugated roofing over it. It's made of 2 4x5 sections. I planned on installing hinges on the 6' side and have both roofs swing open for deliveries, but they were so light I decided to fasten them to the bin with deck screws. They are light enough to remove for deliveries. I wanted a rustic looking bin and I think I nailed it...no pun intended! It should look nice once the wood ages a bit. I did not get a delivery yet, but it seems to be structurally sound. Cross your fingers! Hopefully I can get some video of the delivery. Enjoy the pictures. My poor daughter thought I was building her a playhouse. Wait until it gets filled with coal, it'll break her heart. I guess that's my next project!