The bowden tube should go through the collet, through the entire foot and slide inside the Orbiter Housing.
I recommend desoldering the PC Fan style Molex header on the Orbiter Filament Sensor board and replacing it with a lower profile connector like a JST.
The author remixed this model.
I remixed the Orbiter housing to attach to the outside of the V0.2r1 foot.
I also remixed the V0.2r1 foot to remove the default FRS, to pass the the bowden tube straight through, and allow attaching the housing to the foot.
Original OFS Project: https://www.orbiterprojects.com/orbiter-filament-sensor/
Original Design Files: https://orbiterprojects.com/download/filamentsensor/OrbiterSensor%20v2.3.zip
Original Klipper CFG File: https://www.orbiterprojects.com/download/filamentsensor/OrbiterSensor.cfg