I'm currently waiting for sig to get their kit stock. I'm planning to build a Kadet Senior with ailerons, reduced dihedral, split wing with carbon tube and as a tail dragger. I know i can get an arf but I want a winter project. I'd like to get the carbon tube and receptacle sleeve ordered but I have no idea of the biggest tube I can put in with out the plans on hand. I am wondering if somebody here who has the Sig Kadet Senior kit plans on hand could post the measurements, in millimeters if possible, from the attached pic? Please take all measurements from the very outside edge of the lines on the plans.