An additional note on doing it with whole alternate squares and flying geese blocks and setting on the diagonal, if you use the same units as I showed/measured out, the border will still work the same mathematically. Or, you could complicate things and make Quarter-Square blocks for the alternate blocks, either of my ways is easier.
Keep in mind when cutting the setting triangles that you can't just slice the 12.5 raw block in half, it will be too short! For the setting triangles easiest thing is to make them 1" larger than the block size and either trim down to the seam allowance or allow the design to float.
Edit: I am always concerned about copyright. A block image is not copyrightable. You can take credit for a technique or whatever, but a log cabin block or whatever block is open to all. Drawing out a block like this is fair use -- especially for a "free" pattern but even if not. As I'm mentioning in my post there are various ways to construct this project. If I were to sell this as my own design, there would be issues, or if I took credit, or if I plagiarized their directions. I think the original designer did a nice job with some of the subtle things like I mentioned balancing the dark geese backgrounds with the large dark triangles. They deserve full credit for inspiration.
Last edited by Iceblossom; 10-23-2019 at 04:58 AM.