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My Strut ratios (If I remember correctly ) are about 3:4. Upper struts are nearly 600 long and bottom struts about 400 plus about 140 for the cage structure in the middle. Tube diameter is I think 15 mm, maybe 18mm. Upper struts are thinner walled than lower ( just what I had available at the time ....free ). 8 struts at each end, 4 triangulated pairs and it is the most rigid open structure I have ever built. I reckon I could stand it on end and stand on the top and it would hold my weight without moving at all.
The short length of each set of struts makes for good bracing. The longer they are the more possibility of flex as is noted in bigger truss dobs.
If you want more accurate information happy to provide some measurements but I think you will find that with a relatively light front assembly and short lengths due to the folded nature on the light path you can build something very rigid with care.
Take a look at all the big scopes, they are all truss\strut builds.
Pic of my build just after assembly and before all the bits were added. Sitting in its work\dob base but it mounts to the EQ6 for serious stuff.
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