This is an old topic, but since it's been bumped up, that photo of a Featherweight on a handmade modification to a vehicle depicts an irresponsibly dangerous activity.
In the event of an evasive maneuver or rear end collision, that machine is flying around the cab and/or that passenger's face is slammed into the machine
In the event of a front end collision and airbag deployment, either the modification prevents proper deployment of the airbag OR the machine is explosively thrown into the passenger's chest/throat/face.
The modification alone may have altered/damaged the airbag function of the vehicle.
Don't do it.