Mocking up the vertical fin. Got it on to the boom tube with a little effort and aligned it on to the end of the tube as flush as I was able to. Drilled the 2 holes for the control arm, and to assist in vertical assembly alignment.
Had to borrow a couple tools as I did not have any wrenches in the hangar; only cutting, drilling, and bending. Things to bring next time!

Next steps will be to work on mounting leading edge angle brackets that secure vertical to the tail boom tube on both upper and lower sides.