Hi. I have 2, 4 metre lengths of 9"x3" which I got from the roof of an old house im working on. Nice condition timber which I want to turn into a 18"x3" low level shelf. What would be the best way of joining these 2 pieces together side by side? Bearing in mind its unplanned and quite rough (which is what she wants, don't ask!) so glue/chemical fix perhaps not an option. Im thinking along the lines of the joining bars that are used to join together kitchen work tops but i dont know if that would work. Im a tiler/plumber so reasonably handy with a drill, saw etc etc. Appreciate any help. Thank you.