Looking good mate but i wouldn't have the balls to go that far, cutting the hole for the harrop is all i need. How much weight do you reckon you have lost with the window, roll bar, head pads etc etc all removed then the coupe back fitted, it must be quite a good saving? You have now lost all advisability from the rear, are you going to fit revers cameras?
How do van drivers ever park and drive? Loosing the rear view isn't the end of the world IMO.