If your desire is to get cutting dimensions and not interested in the WTP visual representation of your vessel it’s relatively simple. Remember KISS.
Assuming the design has the larger segment twice the smaller segment, I'm going to use a 12" outside diameter.
1 - Set ring type to Wheel
2 - Make sure the Spoke Width is 0
3 - Set # Segments to 6
This is the 'trick' as the larger segment is SEL and the smaller is SEL/2
4 - Now look at the SEL dimensions
SEL = 6 15/16"
Divide by 3 = 2.3125
5 - Set the spoke width to 2.3125 (2 5/16")
The larger Segment Edge Length is 4 1/4"
The Spoke Width is not exactly half
6 - Tweak the Spoke Width 1/16" at a time until it is 1/2 the SEL
When spoke width is 2 3/16" the SEL is 4 3/8" - exactly as needed
7 - Now let's compensate for the vertical spacer
Assuming the vertical spacer width is 1/8"
8 - Reduce each Segment Edge Length by 1/8"
Hence 6 @ 2 1/16" and 6 @ 4 1/4"