i did this before it took me about 5 minutes...
go out with a few spanners and it is pretty obvious which ya need to do, i would advise taking off all the small lil brackets under seats etc aswell as it tidy's it up a bit...
one thing i will say is though that the bare metal will make the car very very cold during this time of year... the car will be more noisy however your music will be amplified better....
thats what i noticed when i stripped mine...
it makes the saxo feel a lot more fun
but performance wise mate not much however ya will notice a slight difference if you usual drive round with a great big sub and 6x9's and all that all the time