Thanks, torger and others, this thread has been super helpful.

Can someone confirm that entering 2.083 cross (short spokes) and 2.25 (long spokes) into a spoke calculator would give me the exact spoke lengths for this pattern?

At least this is what I get when I follow the Sheldon Brown article and replace the 5° from the formula with 2.5° (short spokes) and 7.5° (long spokes).
I am relatively sure about it, but it would be great to have a second opinion before I buy anything. Thanks!