this pictures is not from my viper , i wait my in few weeks .

here is the engine instalation manual from Thomas ...........

Turbine-installation
For a light and strong fuselage we decided not to go for a turbine-hatch. The canopy is big enough to work on most of the parts. There are two ply-plates supplied to mount the turbine. With a Booster G-80, the plates should be mounted on the rails of the turbine-mount. Make up your mind to either use wood-screws or bolts with blind-nuts in the turbine-plates. Mount the tailpipe to the turbine-plates. Again, using the Booster G-80, the distance between the rear turbine-case and the front of the tailpipe should be 20-25mm (4/5 to 1 inch). It might be necessary to sand the rear of the fuselage to accept the tailpipe. We cut it to about 5mm, just enough to fit and secure the nozzle provided with the tailpipe. Use small button-head screws and cut them inside the fuselage.