I need help. Trying to install a header tank that is aluminum, round with a bracket welded on each end and holds about 1.5gal. Problem is I can't figure out where this thing goes. I seem to have a K3 kit with a mix of K4 parts and information. My manual does not give a clue where it goes. One part says rear mounted header an another says front, but it doesn't seem to fit anywhere. I must confess this is a bit embarrassing, building a plane but can't mount a tank? SCAREY !!!!!!