I am trying to build an ”historic luxury” cabin at a low cost. I purchased 4000 board feet of inch thick rough cut oak. I have framed with 2×4 and plywood and now have the oak nailed to the framing with one and half inch tall gaps between each board to give the chinking look. Can I purchase mortar mix to use for chinking? I cannot afford the 150 dollar 5 gallon chinking at this time. The chinking is just for looks.