These furring strips are usually available in lengths up to 16 feet, so you will likely need a separate one for each side of the curve. The curve need not be uniform throughout its length.

Once all furring strips are in place, attach drywall to them to encase the asbestos. I believe the best approach to encasing the popcorn is to install drywall directly to the ceiling.

For standard 12-inch ceiling tile, the furring strips should be spaced 12 inches apart. If you use wood strips (1 by 2 inches), make sure they are straight, and use thin wood shims behind them ...

If using furring strips, attach them to the joists with 2 ½-inch screws, spaced 16 inches apart. Cut your shiplap boards to size, and attach them to the joists (or furring strips) with a brad nailer.

(Well, I wouldn't do it) You can, however, attach furring strips (1x2s) to the cinderblock, and then mount the DW on that. 16" on center should keep everything nice and smooth.