I've been using Sullivan Carbon rods for my aircraft, even the larger ones (larger meaning my Venus II, Goldberg Skylark 70, and the Tiger 120). They work just fine, but they do need to have the tubes reinforced, ie. epoxied to each and every former as they pass through the fuselage to the rear. I have written up a description as to how I secure the metal clevis rods to the ends using CA and a variable speed drill. I can elaborate if you wish.

CGr.