You lost me. The strip dimension is 1/2" on the flat, 1/4"+ on one edge, and 1/4" on the opposite? Then the cove is cut in the + edge and the bead on the smaller edge?

BTW, there is no need
: to plane these guys to make them fit. Rip them with a 3 degree bevel, and
: they fit pretty well. There is a little step of course at the ends, but if
: you rip a little oversize there is enough meat left that insufficient
: thickness is not an issue.