Zeb, i'll play the advocate for the trim guy. when (and often) a tile is stout like a tumbled stone and the trim is newer style store bought (thin-1/2"thick) i'll notch the horn of the sill to fit over the tile, mount it and slip the tile behind. the casings i might apply also before tiling.. My second thought would be to case over the top of the existing apron and give the window a picture frame look. problem with this idea is i�d have to put a
