From no other point of view other than safety.....MAKE DAMN SURE YOUR SEATBELT MOUNTING BOLT IS LONG ENOUGH!!!!!!!!
I would assume from the way it is mounted that you may not be roadworthy anymore. I am sure that there are legal things to consider with the bolting down of seatbelts.
Other than that I hope your not six foot 2 with big shoulders and long hair...
regards Guy.