Thanks everyone, the education begins :)

Assuming the same triangular pattern of struts, the perimeter struts will have to be longer than the struts connecting to the larger center tube.
This will be embarrassing when the astronauts weld or bolt in the wrong lengths:-)
Unless the robotic welders can tell the difference.
I'd like to see the engineering specs.
- B

Fortunately in my computer game you get the ship pre-assembled. The FEA analysis will have to wait until I retire :)