Booster Tube With Recess

I've printed MileyORiley's Proton Pack and am working on finishing it at the moment. It's an awesome design and is slightly reduced in size (it's 90% scale) which is perfect for me as I'm quite short.

This Thing goes with this design - https://www.thingiverse.com/thing:2479141

I remixed the Booster Tube to add the recess that was missing from the original as personally I felt that it needed to be there to satisfy my OCD. I did a few variants with different sized centre parts but this one