BVM Super (Balsa) Bandit
Once each side's duct fits properly to the fuselage and into the wooden former that sits just below the canopy, the two sides are trimmed / sanded to make sure they are the same length, and then the same process that was used to make the duct fit the inlet is now applied again to make the rear end of the ducts fit into the bypass extension. This results in an (unglued) assembly as shown below: