Actually I believe you can do it if you install the speaker from the outside of the door without cutting, instead of putting it in from the inside (if that makes sense).
I tried to put some 6.5's in mine, and after deciding not to cut, and putting them into the center woofer spot instead, I was told you could install them from over outside of the hole. Oh well (and that door is so much fun to take apart
BTW great taste in Viper models
Cal