Enerjet by Aerotech, Astrobee D Build, Part 33, Ends & Edges

The inside of the interior ring can be roughed up before epoxying to the engine mount tube.

I used one of my diamond files. 

On the right side is the interior ring slid onto the engine tube.

The main body is tied to the larger of the two parachutes.

The upper body gets the smaller chute.

You could do the "loop tie" like on LPR kits, but I tied the shroud lines to the elastic with some doubled Kevlar.