I didn't have to remove my heater but I started to get the cardboard one out, but managed to get it out without doing it.
Just make sure you wipe down where the double sided tape sticks VERY WELL. Maybe put that in the instructions too.
if you do take off the front, make sure you DON'T push it in too far or you'll have trouble getting it out to put the face plate back on.
You must put the front lid on BEFORE you put the side piece on, because you'll never get the piano hinge on and bolted unless it's closed. I learned that little lesson too.
I'm actually thinking of taking it off again and painting it the color of my dash if I can find the color of my dash....
Derek