Estes MRN Orbital Transport Laboratory Build, Part 8, Bottom Nozzle

There are two nozzles glued around the engine mount tube.
The lower, "engine nozzle" is shown in the instructions as single thickness card stock. It would be the first thing to hit the ground and get bent up. Add to that the engine is friction fitted and recessed in the nozzle. I decided to make a nested or "Super Shroud".
This is two identical shrouds, on glued inside another. After they are glued onto the model, they get a CA glue coat. The double thickness shroud ends up very strong, like plastic.

Two shrouds are formed round and the tabs glued.
Some glue stick is rubbed over the outer wall of one of the shrouds.
Press the second shroud over the glued inner shroud.
TIP: For a stronger, smoother nested shroud, rotate the outer shroud so the glue tabs are on opposite sides.

Let dry.
Cut the inside shroud overhand off the bottom with a single edge razor blade, even with the bottom of the outside shroud.

Sand the bottoms even on a block.

Here's how the the finished nested shroud looks. Inside you can see the top "step".
The inside step makes a double contact with the outside of the BT-20 motor mount tube.

I mentioned coating the shroud with a wipe of CA glue.
TIP: Wait until after the shroud is glued onto the model. CA glue would seal the card stock, the white or wood glue wouldn't be able to soak in.