I took some time to position the tank ribs and baffle into position onto the left wing to get my head around the next few steps. After some research I decided not to follow Van's instructions in regard to drilling the Z-Brackets and instead I used the method outlined by Dan Chekoway. (http://www.rvproject.com/20020605.html). It's a much better way and looks like it will ensure a good tight joint between the tank and leading assembly. (Thanks Dan!)
Tank ribs and baffle in position
Z-Bracket marked 1/16" towards web from centerline