Cut the end of your piece on a 45 degree miter. 1" lumber works great for this job.

Mark 2 3/4" from the end.

Mark 2 3/4" from the edge of the board.

Then mark 1 1/8" from each end.

Using an object with a desirable radius (WD-40 can works perfectly), mark the arc on your piece.

Make a jigsaw cut down your arc.

Cut the straight lines. Be careful and prudent. Safety is important.

Make a mirror image of that piece.

I used glue, a trim nailer, and some blocking to make them very strong.

Cut the feet to length and tap them in carefully with a rubber mallet. In some places, I added a small dab of glue to the floor to keep the feet in place.