[PhilD]

"No person shall operate a motor vehicle or combination on a highway unless the vehicle or combination is equipped with at least ONE mirror, or similar device, which provides the driver an unobstructed view of the highway to the rear of the vehicle."

My interpretation of this is that it would be legal to drive doors off and not have to worry about relocating the side mirrors.

Yup, as long as you have one rear view mirror, like the one on your windshield, then you will be within the law according to that.