@draco
A few notes:
0. Porcelyne has a good YouTube series on making the Laurel (https://www.youtube.com/playlist?list=PLTFWPyzd_SkSxexZnMjYAnn5aEeEzXzEv)
1. Use the best wide (2.5cm) strap elastic you can get. Don't make narrow straps without first trying wide ones.
2. Use good, soft, even wider (3.5-4 cm) band elastic. My local expert on this says it makes a HUGE difference in comfort, especially if you don't like pressure on your lower rib cage.
3. If you make a second one, it's easy to adjust the strap position in or out a bit in back to put the straps where you want over your shoulders, based on how the first one fits.
4. We ran into one instance in which the band elastic started to twist in its casing. You might want to zig-zag one edge of the elastic to the inside half of the band casing to prevent this.
My wife's not a runner, so I've no clue how good the support is for jogging.
Best of luck if you decide to make this one.