Falcon9 Block5 Interstage for the Spacex flying model kit

As my f9 had a rather harsh landing, i had to replace the interstage tubing (i split the the model other than in the spacex kit to emulate real 1st and 2nd stage operation [https://oxidansky.space/2018/02/22/falcon-9-model-hack/])

This is the first attempt, for a simple replacement.
A suitable 2nd stage/fairing will follow.