Just a mite confused but isn't this a spar. I understand not using bass wood for a joiner but every kit I have ever built has either a bass wood spar or a balsa spar. I just finished a wing for an Up-Roar and it used bass wood spars. In my case this isn't a kit but one of my rip off scratch builds and I cut my own wood. In this case this wing has a top and bottom 1/4 sq. bass wood spar. Is the OP asking about a spar or joiner?? I keep two big blocks of bass wood on hand just for cutting spars as needed.