I used to do the wood shed. 24' x 24' with 10' ceiling. Held a lot of split wood, but had problems with racoons using for their latrine. Once they started, it became unbearable (and deep!!). Put in 8 6x6 treated posts, 2x10 rim boards, and 24' trusses with 2' overhang.
But I moved the wood to pallets now, and cover the tops with rubber roofing squares to shed water. Dries outside, and is ready for burning after two years drying. Move the pallets with pallet forks either on FEL or 3 ph. Split and stack right away on the pallet, and then don't touch the split wood until ready to burn it.