Status update:
After lots of back and forth with Sonex around christmas and new years, they were not able to determine why I had a gap (which was unacceptable) between the spar and the tunnel.
Some key measurements that are not on the plans:
Expected gap between spar and tunnel: 1/32"
Distance between forward and aft vertical angles (SNB-F14-08 and -09): 3 37/64"
If I had to speculate where the error came from, it is probably in the pre-drilled holes in the SNB-F14-08 and -09 vertical angles (just my educated guess based on 15 years in the aerospace industry).
To fix the error, I fabricated spacers and installed them on the forward side of the tunnel.