Truth right here, that mugen thing is just as bad as the cusco “show” cages or whatever the hell they call them for subarus.
On a semi helpful note, where does your head come in relation to the cage? You mention you bought padding, assuming you are going to drive the car without a helmet I highly suggest getting the dual density SFI approved padding. It might give your head a chance to slow down a little bit before it hits the dense padding which is meant to be hit by a helmet.