My home has a rather large hole in the wall from, where a artificial fireplace use to be. It is on a artificial brick textured wall, I would like to cover the hole with some beadboard. I am planning on building a patch, for the hole out of 2x4's and plywood, so there is so strangth in the middle of the board. My question is how can I make the beadboard nice and smooth when it is on such a uneven surfice. I am trying to avoid replastering the whole wall. Thanks for any info sorry if this is hard to understand