Start from the edge that will show, or at least measure and cut the
first(wall) board thinner, rather than the last. This way the front piece
should be several feet wide given the shallow curve.
Joe

Jim wrote:

think I should do it parallel with the wall (e.g. long direction) or
diagonal? I think straight out from wall wouldnt look good...if I do it long
direction, the last board will be a sliver at the peak of the stage/radius.