Lumber, 6/4, 5/4, 4/4. (hardwood lumber is measured rough, before milling, so 6/4 is 1 1/2" thick, milling out to 1 1/4" thick. Similar to the 2 x 4 framing lumber that is actually 1 1/2". X. 3.1/2" On an overhead rack in the studio. This is for one frame, four feet x eight feet. By storing it on an overhead rack with air spaces around each piece it can acclimate to my studio conditions, and dry more if needed. Tomorrow, I'll do some moisture readings to see where I'm at, in moisture content terms. I generally buy lumber as needed, though there is always an accumulation.
A corner of the studio, the wall where the lumber leans; some black walnut boards, birdseye maple, basswood, oak. All extras from projects past. I've been trying to eliminate the really small stuff, but it's hard to cut and burn a piece that might be useful some day. This corner used to be twice as full; As long as I don't think about it too much.
Another overhead rack that holds the ten foot and longer pieces; in the back is a black walnut board, 8/4, 12 or 14" wide, and I think 10' long, maybe more. A remnant of my rocking chair project. I think I bought a lot, as those boards had a subtle purple cast, like the wood had been air-dried, or kiln dried by somebody with a real feel for the wood. That purple color is rare in black walnut; more common when the lumber is air dried, though not a given. Like my post on popple, and rainbow poplar, a few back, cutting open a board can be magic. Jame Krenov, and George Nakashima have both written of it in their books on woodworking.