So I have a bay window where i want to build a seat into the bay. My house is old (United kingdom built circa 1930) and I can't for the life of me find any wall studs. It's lathe and plaster walls, I've tried a really strong magnet without luck. I pulled out a skirting board (baseboard) under one angled side of the bay window and all that's there is brick. I'm thinking the entire underneath of the bay window is possibly pure brick and mortar. I've yet to remove the boards under the rest of the window area. is it safe for me to drill mount my wooden frames for the window seat straight into brick and mortar? That would mean drilling through 2inches of wood frame for the seat, then around another inch of plaster before I get to the brick.