excellent...!!!I use two bales of hay per pen. Usually alfalfa or a mixed hay including a legume. On bale is busted up while the second is positioned on the north side of the loose hay. Then each morning I toss intact grains on bale and among loose hay. The birds work through that mess much of the day just to get those grains.
A few years back prior to having barn in place I got more bales and a couple wooden pallets that were used to construct a loosely defined hut. Again a bale, or two, was busted. In that setting the birds spent much of their time on the loose hay in sun but out of the wind. When is got really cold they would cluster on wooden pallets and stand their most of the day with only two feeding bouts. First feeding bout was in the morning and second just before going to roost.
When snow was pushing two feet deep, the birds would literally fly between roost and that hay bale / pallet pile avoiding contact with snow. Leaving and returning to roost was also more during daylight that otherwise. Exception to this was first blizzard of season when many did not come off roost at all. Roost in that setting was work table on north facing porch of house.
great ideas...!!!