Today was "tunneling" day. After measuring, and cutting out the tunnel, 1/16" balsa sides were installed with grain vertical. They are glued to the edges of the cutout section of the belly pan, and along the full length of the wing. Then sealed with thin epoxy. The canister shown is the KS #76-4, it weighs about 5.7 oz, and will be installed exactly on CG, connected to the Mueller header. This is not a tuned system, but the ST will not need boost in this application.