I had previousely inserted a steel rod into the pushrod tube, and these magnets help me align the tube, and the exit is taped in location . If you look close there’s also a wax paper covered spacer at the entrance to the tube to allow for clearance of the tenon on the back end of the pod as it needs to slip into the boom
epoxy, some use CA, not a fan this epoxy should run down the full length of the boom tube interface. Previousely wiped the inside of the boom with alcohol
How much, this much, a bit of a guess as usual, standing the boom up, one can shine a light in from the bottom and clearly see the glue run down, later lay the boom on the side for cure
servo tray and servos, need clearance for battery, and receiver aft