I have two GTD doors with Gurney bubbles on them Both left and right. Both door are as delivered with no trimming, holes for side windows, latches etc. Will trade for normal doors for GTD in same condition. They are located in Northern California USA.
Purely from a safety perspective, it would be far better to lower the driver than to raise the roof. In a roll situation, you really don't want the highest point in the car to be your head. Understandably, thats not always possible though.