These images are of an actual Grand Central tower.
Early towers were basic tube to tube joints, as with the "McDonnell tower" used on the "prototype flights" up to, and including LJ5. From then on Grand Central Rocket Corp supplied the "Tower" as well as the escape motor. They all used "Grand Central" escape motors.
Main uprights were 2" stainless steel, with 1" cross bracings. Inverted "V" supports to clampring were approx 1-5/8" with flattened inner surfaces for extra clearence with the antenna cone.
NOTE! The spacing ratio for the inverted "V" struts to tower clamp-ring are as follows. Between the legs of the "V" struts themselves, the spacing is 64 degrees. The "spacing" between each "pair" of inverted "V" struts, is 56 degrees.
(The 6 contact points of the legs to theTower clamp-ring, are not equally spaced at 60 degrees!.)
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If further details are required please contact me. p.mcquillan@ntlworld.com